Question

By the pythagoras theorem??​

Answer 1

Answer: sec^2 theta - tan^2 theta=1

It cannot be proved by Pythagoras theorem. You need trigonometric identities.

Step-by-step explanation:- sec^theta=1/cos^2theta ( it's a formula)

1-sin^2 theta=cos^2theta

We get,

1/cos^2theta-sin^2theta/cos^2theta=1-sin^2theta/cos^2theta=cos^2theta/cos^2theta=1 (hence proved)

Answer 2

Step-by-step explanation:

hope it helps ☺️☺️☺️☺️☺️☺️☺️☺️