Question

please tell this 76th question
options are also available but explain me how to solve it ​

Answer 1

Step-by-step explanation:

We have,

$\left| \begin{array}{cc} \tt {cot( \theta) } & \tt{cosec( \theta)} \\ \tt{cosec( \theta)}& \tt{cot( \theta)}\end{array} \right|$

$= \tt {cot ^{2} ( \theta) - cosec^{2} ( \theta)}$

$= - 1$