derivative (sec(x))/(7+sec(x))

解答

导数

\frac{sec ( x )}{7 + sec ( x )}

\frac{7 sec ( x ) tan ( x )}{( 7 + sec ( x ) ) ^{2}}

求解步骤

\frac{d}{d x} (\frac{sec ( x )}{7 + sec ( x )})

使用微分除法定则:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= \frac{\frac{d}{d x} ( sec ( x ) ) ( 7 + sec ( x ) ) - \frac{d}{d x} ( 7 + sec ( x ) ) sec ( x )}{( 7 + sec ( x ) ) ^{2}}

\frac{d}{d x} (sec (x)) = sec (x) tan (x)

\frac{d}{d x} (7 + sec (x)) = sec (x) tan (x)

= \frac{sec ( x ) tan ( x ) ( 7 + sec ( x ) ) - sec ( x ) tan ( x ) sec ( x )}{( 7 + sec ( x ) ) ^{2}}

化简

\frac{sec ( x ) tan ( x ) ( 7 + sec ( x ) ) - sec ( x ) tan ( x ) sec ( x )}{( 7 + sec ( x ) ) ^{2}} : \frac{7 sec ( x ) tan ( x )}{( 7 + sec ( x ) ) ^{2}}

= \frac{7 sec ( x ) tan ( x )}{( 7 + sec ( x ) ) ^{2}}

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