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人気のある三角関数 >

1/(cos(x))+sec^2(x)-1-cos(x)=0

解

\frac{1}{cos ( x )} + sec^{2} (x) - 1 - cos (x) = 0

解

x = π + 2 πn, x = 2 πn

+1

度

x = 18 0^{\circ} + 36 0^{\circ} n, x = 0^{\circ} + 36 0^{\circ} n

解答ステップ

\frac{1}{cos ( x )} + sec^{2} (x) - 1 - cos (x) = 0

簡素化

\frac{1}{cos ( x )} + sec^{2} (x) - 1 - cos (x) : \frac{1 + sec ^{2} ( x ) cos ( x ) - cos ( x ) - cos ^{2} ( x )}{cos ( x )}

\frac{1}{cos ( x )} + sec^{2} (x) - 1 - cos (x)

元を分数に変換する:

sec^{2} (x) = \frac{sec ^{2} ( x ) cos ( x )}{cos ( x )}, 1 = \frac{1 cos ( x )}{cos ( x )}, cos (x) = \frac{cos ( x ) cos ( x )}{cos ( x )}

= \frac{1}{cos ( x )} + \frac{sec ^{2} ( x ) cos ( x )}{cos ( x )} - \frac{1 \cdot cos ( x )}{cos ( x )} - \frac{cos ( x ) cos ( x )}{cos ( x )}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{1 + sec ^{2} ( x ) cos ( x ) - 1 \cdot cos ( x ) - cos ( x ) cos ( x )}{cos ( x )}

1 + sec^{2} (x) cos (x) - 1 \cdot cos (x) - cos (x) cos (x) = 1 + sec^{2} (x) cos (x) - cos (x) - cos^{2} (x)

1 + sec^{2} (x) cos (x) - 1 \cdot cos (x) - cos (x) cos (x)

1 \cdot cos (x) = cos (x)

1 \cdot cos (x)

乗算:

1 \cdot cos (x) = cos (x)

= cos (x)

cos (x) cos (x) = cos^{2} (x)

cos (x) cos (x)

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

cos (x) cos (x) = cos^{1 + 1} (x)

= cos^{1 + 1} (x)

数を足す:

1 + 1 = 2

= cos^{2} (x)

= 1 + sec^{2} (x) cos (x) - cos (x) - cos^{2} (x)

= \frac{1 + sec ^{2} ( x ) cos ( x ) - cos ( x ) - cos ^{2} ( x )}{cos ( x )}

\frac{1 + sec ^{2} ( x ) cos ( x ) - cos ( x ) - cos ^{2} ( x )}{cos ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

1 + sec^{2} (x) cos (x) - cos (x) - cos^{2} (x) = 0

三角関数の公式を使用して書き換える

1 - cos (x) - cos^{2} (x) + cos (x) sec^{2} (x)

基本的な三角関数の公式を使用する:

cos (x) = \frac{1}{sec ( x )}

= 1 - \frac{1}{sec ( x )} - (\frac{1}{sec ( x )})^{2} + \frac{1}{sec ( x )} sec^{2} (x)

簡素化

1 - \frac{1}{sec ( x )} - (\frac{1}{sec ( x )})^{2} + \frac{1}{sec ( x )} sec^{2} (x) : 1 - \frac{1}{sec ( x )} - \frac{1}{sec ^{2} ( x )} + sec (x)

1 - \frac{1}{sec ( x )} - (\frac{1}{sec ( x )})^{2} + \frac{1}{sec ( x )} sec^{2} (x)

(\frac{1}{sec ( x )})^{2} = \frac{1}{sec ^{2} ( x )}

(\frac{1}{sec ( x )})^{2}

指数の規則を適用する:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

= \frac{1 ^{2}}{sec ^{2} ( x )}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1}{sec ^{2} ( x )}

\frac{1}{sec ( x )} sec^{2} (x) = sec (x)

\frac{1}{sec ( x )} sec^{2} (x)

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot sec ^{2} ( x )}{sec ( x )}

乗算:

1 \cdot sec^{2} (x) = sec^{2} (x)

= \frac{sec ^{2} ( x )}{sec ( x )}

共通因数を約分する:

sec (x)

= sec (x)

= 1 - \frac{1}{sec ( x )} - \frac{1}{sec ^{2} ( x )} + sec (x)

= 1 - \frac{1}{sec ( x )} - \frac{1}{sec ^{2} ( x )} + sec (x)

1 - \frac{1}{sec ^{2} ( x )} - \frac{1}{sec ( x )} + sec (x) = 0

置換で解く

1 - \frac{1}{sec ^{2} ( x )} - \frac{1}{sec ( x )} + sec (x) = 0

仮定:

sec (x) = u

1 - \frac{1}{u ^{2}} - \frac{1}{u} + u = 0

1 - \frac{1}{u ^{2}} - \frac{1}{u} + u = 0 : u = - 1, u = 1

1 - \frac{1}{u ^{2}} - \frac{1}{u} + u = 0

LCMで乗じる

1 - \frac{1}{u ^{2}} - \frac{1}{u} + u = 0

以下の最小公倍数を求める:

u^{2}, u : u^{2}

u^{2}, u

最小公倍数 (LCM)

u^{2}

または以下のいずれかに現れる因数で構成された式を計算する:

u

= u^{2}

以下で乗じる: LCM=

u^{2}

1 \cdot u^{2} - \frac{1}{u ^{2}} u^{2} - \frac{1}{u} u^{2} + u u^{2} = 0 \cdot u^{2}

簡素化

1 \cdot u^{2} - \frac{1}{u ^{2}} u^{2} - \frac{1}{u} u^{2} + u u^{2} = 0 \cdot u^{2}

簡素化

1 \cdot u^{2} : u^{2}

1 \cdot u^{2}

乗算:

1 \cdot u^{2} = u^{2}

= u^{2}

簡素化

- \frac{1}{u ^{2}} u^{2} : - 1

- \frac{1}{u ^{2}} u^{2}

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= - \frac{1 \cdot u ^{2}}{u ^{2}}

共通因数を約分する:

u^{2}

= - 1

簡素化

- \frac{1}{u} u^{2} : - u

- \frac{1}{u} u^{2}

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= - \frac{1 \cdot u ^{2}}{u}

乗算:

1 \cdot u^{2} = u^{2}

= - \frac{u ^{2}}{u}

共通因数を約分する:

u

= - u

簡素化

u u^{2} : u^{3}

u u^{2}

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

u u^{2} = u^{1 + 2}

= u^{1 + 2}

数を足す:

1 + 2 = 3

= u^{3}

簡素化

0 \cdot u^{2} : 0

0 \cdot u^{2}

規則を適用

0 \cdot a = 0

= 0

u^{2} - 1 - u + u^{3} = 0

u^{2} - 1 - u + u^{3} = 0

u^{2} - 1 - u + u^{3} = 0

解く

u^{2} - 1 - u + u^{3} = 0 : u = - 1, u = 1

u^{2} - 1 - u + u^{3} = 0

標準的な形式で書く

a_{n} x^{n} + \dots + a_{1} x + a_{0} = 0

u^{3} + u^{2} - u - 1 = 0

因数

u^{3} + u^{2} - u - 1 : (u + 1)^{2} (u - 1)

u^{3} + u^{2} - u - 1

= (u^{3} + u^{2}) + (- u - 1)

- 1

を

- u - 1 : - (u + 1)

からくくり出す

- u - 1

共通項をくくり出す

- 1

= - (u + 1)

u^{2}

を

u^{3} + u^{2} : u^{2} (u + 1)

からくくり出す

u^{3} + u^{2}

指数の規則を適用する:

a^{b + c} = a^{b} a^{c}

u^{3} = u u^{2}

= u u^{2} + u^{2}

共通項をくくり出す

u^{2}

= u^{2} (u + 1)

= - (u + 1) + u^{2} (u + 1)

共通項をくくり出す

u + 1

= (u + 1) (u^{2} - 1)

因数

u^{2} - 1 : (u + 1) (u - 1)

u^{2} - 1

1

を書き換え

1^{2}

= u^{2} - 1^{2}

2乗の差の公式を適用する:

x^{2} - y^{2} = (x + y) (x - y)

u^{2} - 1^{2} = (u + 1) (u - 1)

= (u + 1) (u - 1)

= (u + 1) (u + 1) (u - 1)

改良

= (u + 1)^{2} (u - 1)

(u + 1)^{2} (u - 1) = 0

零因子の原則を使用:

ab = 0

ならば

a = 0

または

b = 0

u + 1 = 0 or u - 1 = 0

解く

u + 1 = 0 : u = - 1

u + 1 = 0

1

を右側に移動します

u + 1 = 0

両辺から

1

を引く

u + 1 - 1 = 0 - 1

簡素化

u = - 1

u = - 1

解く

u - 1 = 0 : u = 1

u - 1 = 0

1

を右側に移動します

u - 1 = 0

両辺に

1

を足す

u - 1 + 1 = 0 + 1

簡素化

u = 1

u = 1

解答は

u = - 1, u = 1

u = - 1, u = 1

解を検算する

未定義の (特異) 点を求める:

u = 0

1 - \frac{1}{u ^{2}} - \frac{1}{u} + u

の分母をゼロに比較する

解く

u^{2} = 0 : u = 0

u^{2} = 0

規則を適用

x^{n} = 0 \Rightarrow x = 0

u = 0

u = 0

以下の点は定義されていない

u = 0

未定義のポイントを解に組み合わせる:

u = - 1, u = 1

代用を戻す

u = sec (x)

sec (x) = - 1, sec (x) = 1

sec (x) = - 1, sec (x) = 1

sec (x) = - 1 : x = π + 2 πn

sec (x) = - 1

以下の一般解

sec (x) = - 1

sec (x)

2 πn

循環を含む周期性テーブル :

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = π + 2 πn

x = π + 2 πn

sec (x) = 1 : x = 2 πn

sec (x) = 1

以下の一般解

sec (x) = 1

sec (x)

2 πn

循環を含む周期性テーブル :

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = 0 + 2 πn

x = 0 + 2 πn

解く

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn

すべての解を組み合わせる

x = π + 2 πn, x = 2 πn

グラフ

人気の例

tan(θ)=(sqrt(3))/3 ,180<= θ<= 360

tan (θ) = \frac{3}{3}, 18 0^{\circ} \leq θ \leq 36 0^{\circ}

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7.5 = 5 sin (\frac{π}{2} (x - 2)) + 5

2cos(θ)+2sqrt(3)=sqrt(3)

2 cos (θ) + 23 = 3

-2sqrt(2)=-4sin(2θ)

- 22 = - 4 sin (2 θ)

8cos(x)=4cos^2(x)+3

8 cos (x) = 4 cos^{2} (x) + 3