Question

If $f(x)=2\sin x-3x^4+8,$ then $f^{\prime }(x)$ is

• A. $2\sin x-12x^3$
• B. $2\cos x-12x^3$
• C. $2\cos x+12x^3$
• D. $2\sin x+12x^3$

Answer 1

Answer: (B)

$f^{\prime }(x)=2\cos x-12x^3$