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Popolare Trigonometria >

0<cos(θ)<1

Soluzione

0 < cos (θ) < 1

Soluzione

2 πn < θ < \frac{π}{2} + 2 πn or \frac{3 π}{2} + 2 πn < θ < 2 π + 2 πn

+2

Notazione dell’intervallo

(2 πn, \frac{π}{2} + 2 πn) \cup (\frac{3 π}{2} + 2 πn, 2 π + 2 πn)

Decimale

2 πn < θ < 1.57079 \dots + 2 πn or 4.71238 \dots + 2 πn < θ < 6.28318 \dots + 2 πn

Fasi della soluzione

0 < cos (θ) < 1

Se

a < u < b

allora

a < u and u < b

0 < cos (θ) and cos (θ) < 1

0 < cos (θ) : - \frac{π}{2} + 2 πn < θ < \frac{π}{2} + 2 πn

0 < cos (θ)

Scambia i lati

cos (θ) > 0

Per

cos (x) > a

, se

- 1 \leq a < 1

allora

- arccos (a) + 2 πn < x < arccos (a) + 2 πn

- arccos (0) + 2 πn < θ < arccos (0) + 2 πn

Semplificare

- arccos (0) : - \frac{π}{2}

- arccos (0)

Usare la seguente identità triviale:

arccos (0) = \frac{π}{2}

x - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arccos (x) π \frac{5 π}{6} \frac{3 π}{4} \frac{2 π}{3} \frac{π}{2} \frac{π}{3} \frac{π}{4} \frac{π}{6} 0 arccos (x) 18 0^{\circ} 15 0^{\circ} 13 5^{\circ} 12 0^{\circ} 9 0^{\circ} 6 0^{\circ} 4 5^{\circ} 3 0^{\circ} 0^{\circ}

= - \frac{π}{2}

Semplificare

arccos (0) : \frac{π}{2}

arccos (0)

Usare la seguente identità triviale:

arccos (0) = \frac{π}{2}

x - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arccos (x) π \frac{5 π}{6} \frac{3 π}{4} \frac{2 π}{3} \frac{π}{2} \frac{π}{3} \frac{π}{4} \frac{π}{6} 0 arccos (x) 18 0^{\circ} 15 0^{\circ} 13 5^{\circ} 12 0^{\circ} 9 0^{\circ} 6 0^{\circ} 4 5^{\circ} 3 0^{\circ} 0^{\circ}

= \frac{π}{2}

- \frac{π}{2} + 2 πn < θ < \frac{π}{2} + 2 πn

cos (θ) < 1 : 2 πn < θ < 2 π + 2 πn

cos (θ) < 1

Per

cos (x) < a

, se

- 1 < a \leq 1

allora

arccos (a) + 2 πn < x < 2 π - arccos (a) + 2 πn

arccos (1) + 2 πn < θ < 2 π - arccos (1) + 2 πn

Semplificare

arccos (1) : 0

arccos (1)

Usare la seguente identità triviale:

arccos (1) = 0

x - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arccos (x) π \frac{5 π}{6} \frac{3 π}{4} \frac{2 π}{3} \frac{π}{2} \frac{π}{3} \frac{π}{4} \frac{π}{6} 0 arccos (x) 18 0^{\circ} 15 0^{\circ} 13 5^{\circ} 12 0^{\circ} 9 0^{\circ} 6 0^{\circ} 4 5^{\circ} 3 0^{\circ} 0^{\circ}

= 0

Semplificare

2 π - arccos (1) : 2 π

2 π - arccos (1)

Usare la seguente identità triviale:

arccos (1) = 0

x - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arccos (x) π \frac{5 π}{6} \frac{3 π}{4} \frac{2 π}{3} \frac{π}{2} \frac{π}{3} \frac{π}{4} \frac{π}{6} 0 arccos (x) 18 0^{\circ} 15 0^{\circ} 13 5^{\circ} 12 0^{\circ} 9 0^{\circ} 6 0^{\circ} 4 5^{\circ} 3 0^{\circ} 0^{\circ}

= 2 π - 0

2 π - 0 = 2 π

= 2 π

0 + 2 πn < θ < 2 π + 2 πn

Semplificare

2 πn < θ < 2 π + 2 πn

Combina gli intervalli

- \frac{π}{2} + 2 πn < θ < \frac{π}{2} + 2 πn and 2 πn < θ < 2 π + 2 πn

Unire gli intervalli sovrapposti

2 πn < θ < \frac{π}{2} + 2 πn or \frac{3 π}{2} + 2 πn < θ < 2 π + 2 πn

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tan(θ)=-12/5 \land sin(θ)>0

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