例4求y=secx的导数 解y=(eox)y=(-) cos r (cos x) sin x =secx tanx cos cos 同理可得(cscx)=- cscxcot x 例5求y= sinha的导数 解 y=(sinhx =(e=e-xl=e te x)=cosh x 2 同理可得( cosh x)'= sinha tahr)=I cosh x 上页例4 求 y = sec x的导数 . 解 ) cos 1  = (sec ) = (  x y x x x 2 cos − (cos ) = = sec x tan x. x x 2 cos sin = 同理可得 (csc x) = −csc x cot x. 例5 求 y = sinh x 的导数 . 解 ( )] 2 1  = (sinh ) = [ −  x − x y x e e ( ) 2 1 x x e e − = + = cosh x. 同理可得 (cosh x) = sinh x x x 2 cosh 1 (tanh ) =