The maximum value of
$(\cos\alpha_1)(\cos\alpha_2)\cdots(\cos\alpha_n)$
where $0\le \alpha_1,\alpha_2,\ldots,\alpha_n\le\pi$ and
$(\cot\alpha_1)(\cot\alpha_2)\cdots(\cot\alpha_n)=1$ is
🎥 Video solution / Text Solution of this question is given below:
By AM–GM, maximum occurs when
$\alpha_1=\alpha_2=\cdots=\alpha_n=\frac{\pi}{4}$
Then
$\cos\alpha_i=\frac{1}{\sqrt2}$
Product $=\left(\frac{1}{\sqrt2}\right)^n=\frac{1}{2^{n/2}}$