Question

show that tan²thetha -1/cos²thetha=-1​

Answer 1

Answer:

In this question I am replace theta by X

Then

tan²x - 1/cos²x = -1

tan² x - sec²x = -1 we know that 1 /cos²x

- ( - tan²x + sec²x ) = -1 = sec²x

- ( sec²x - tan²x ) = -1

- ( 1) = -1

-1 = -1

LHS = RHS