Question

Giúp e giải đi mn

Answer 1

a.

\(y'=\left(x^2\right)'-\left(cosx\right)'=2x-\left(-sinx\right)=2x+sinx\)

b.

\(y'=\left(3sinx\right)'+\left(2cosx\right)'=3cosx+\left(-2sinx\right)=3cosx-2sinx\)

c.

\(y'=\left(5cos\left(2x-\dfrac{\pi}{4}\right)\right)'=5\left(2x-\dfrac{\pi}{4}\right)'.\left(-sin\left(2x-\dfrac{\pi}{4}\right)\right)=-10sin\left(2x-\dfrac{\pi}{4}\right)\)