Question

Calcule a derivada f(x)= 2x Cos (x²)

Answer 1

(f.g)' = f'g + fg'

f(x) = 2x.cos(x²)

df(x)/dx = 2.cos(x²) + 2x .(- sen(x²)).2x

= 2cos(x²) - 4x²sen(x²)