A) \[{{2}^{20}}(\cos 2x-{{2}^{20}}\cos 4x)\]
B) \[{{2}^{20}}(\cos 2x+{{2}^{20}}\cos 4x)\]
C) \[{{2}^{20}}(\sin 2x+{{2}^{20}}\sin 4x)\]
D) \[{{2}^{20}}(\sin 2x-{{2}^{20}}\sin 4x)\]
Correct Answer: B
Solution :
\[y=\cos 4x+\cos 2x\Rightarrow \frac{{{d}^{20}}y}{d{{x}^{20}}}={{4}^{20}}\cos 4x+{{2}^{20}}\cos 2x\].
You need to login to perform this action.
You will be redirected in
3 sec
