derivative of ln(cosh(x))

解答

\frac{d}{d x} (ln (cosh (x)))

tanh (x)

求解步骤

\frac{d}{d x} (ln (cosh (x)))

使用连锁律:

\frac{1}{cosh ( x )} \frac{d}{d x} (cosh (x))

= \frac{1}{cosh ( x )} \frac{d}{d x} (cosh (x))

\frac{d}{d x} (cosh (x)) = sinh (x)

= \frac{1}{cosh ( x )} sinh (x)

化简

\frac{1}{cosh ( x )} sinh (x) : tanh (x)

= tanh (x)

\frac{\partial}{\partial y} (x cos (y) + y e^{x})

\frac{d}{d x} (\frac{x ^{2} - 1}{2 x})

x \to - 2 lim (\frac{2 - x ^{2}}{4 x})

(x^{2} + 1) (\frac{d y}{d x}) + 3 x (y - 1) = 0, y (0) = 6

d er i v a t i v e \frac{1}{3 ( 4 - x ^{3} ) ^{4}}