If $\displaystyle \cos \theta =\frac{5}{13}$, where $\theta$ being an acute angle, then the value of $\dfrac{\cos \theta +5\cot \theta }{\text {cosec}\ \theta -\cos \theta }$ will be

$\tan \theta=p \text { হলে, } \cos 2 \theta=\text { কত? }$

What is $\cot(\dfrac{A}{2})-\tan(\dfrac{A}{2})$ equal to ?

n যেকোনো ধনাত্মক বেজোড় সংখ্যা হলে 

$\begin{array}{l} \frac{\cos ^{4} x}{\cos ^{2} y}+\frac{\sin ^{4} x}{\sin ^{2} y}=1 \text { হলে} \frac{\cos ^{4} y}{\cos ^{2} x}+\frac{\sin ^{4} y}{\sin ^{2} x} \\\end{array}$ এর মান কত?