Solve this :   Please solve. Do not send any links. Please answer the question.

$40. \frac{1}{{\cot }^2\mathrm{\theta }}+\frac{1}{1+{\tan }^2\mathrm{\theta }}=\frac{1}{1-{\sin }^2\mathrm{\theta }}-\frac{1}{{\mathrm{cosec}}^2}$