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Some problems about the derivative formula of senior high school mathematics
Cutting party:

Correct and cotangent; Secant refers to secant and cotangent, that is, the derivatives of tangent and cotangent are the squares of secant and cotangent.

Tangent (tanx)' = seconds? x= 1/cos? x

Cotangent (cotx)'=-csc? x=- 1/sin? x

Cut, multiply and cut: the derivatives of secant and cotangent are multiplied by the corresponding tangent and cotangent.

(secx)′= secx tanx

(cscx)' =-cscx cotx

Inverse fraction: that is, the derivative of the inverse function is no longer a trigonometric function (the way has changed)

Arcsinx' = 1/√ ( 1-x? )

Arccosx' =- 1/√ ( 1-x? )

Arctanx' = 1/( 1+x? )

Arccotx' =- 1/( 1+x? )