Question

tan²x sec²x(cot²x-cos²x)=​

Answer 1

Step-by-step explanation:

.sin²x + cos²x ≡1 , 1 + tan²x ≡ sec²x , 1 + cot²x ≡ cosec²x

In this video you are shown the Pythagorean identities and how they are derived. In a later tutorial you will have to prove identities using these.

Pythagorean Identities:

sin2θ + cos2θ ≡ 1

1 + tan2θ ≡ sec2θ

1 + cot2θ ≡ cosec2θ