$\sin{θ} = \frac{4}{5}$ এবং $\frac{π}{2} < θ < π$  হয়, তবে 

$\frac{\tan{\theta} + \sec{\left ( - \theta \right )}}{\cot{\theta} + \cos{e} c \left ( - \theta \right )} = ?$

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

n যেকোনো ধনাত্মক বেজোড় সংখ্যা হলে  $\sin{\left \lbrace n π + \left ( - 1 \right )^{n} \frac{π}{3} \right \rbrace}$ এর মান কত?

The value of $\cosec\dfrac{\pi}{18}-\sqrt{3} \sec \dfrac{\pi}{18}$ is a-

$2\sec^{2}\theta -\sec^{4}\theta -2\cosec^{2}\theta +\cosec^{4}\theta = ?$