Question

$l={\left(\frac{{\cot }^{2}x\cdot {\cos }^{2}x}{{\cot }^{2}x-{\cos }^{2}x}\right)}^2$ and $m=a^{\log }\sqrt{2}\left[2\cos \frac{y}{2}\right]$, at $y=4\pi$, then $l^2+m^2$ is equal to -

• A. 4
• B. 16
• C. 17
• D. none of these

Answer 1

Answer: (C)

Correct answer is (c) 17