Question

Tính đạo hàm của các hàm số sau:

a) \(y = x{\sin ^2}x;\)                                

b) \(y = {\cos ^2}x + \sin 2x;\)

c) \(y = \sin 3x - 3\sin x;\)                          

d) \(y = \tan x + \cot x.\)

Answer 1

tham khảo:

a)\(y'=xsin2x+sin^2x\)

\(y'=sin^2x+xsin2x\)

b)\(y'=-2sin2x+2cosx\\ y'=2\left(cosx-sin2x\right)\)

c)\(y=sin3x-3sinx\)

\(y'=3cos3x-3cosx\)

d)\(y'=\dfrac{1}{cos^2x}-\dfrac{1}{sin^2x}\)

\(y'=\dfrac{sin^2x-cos^2x}{sin^2x.cos^2x}\)