Question

prove
-tan^2(x)+sec^2(x)=1

Answer 1

firstly express the Right hand side term

Answer 2

write sec as 1/cos and tan as sin/cos

Answer 3

then u'll get
1/(cos(x)) ^2 - (sin(x))/(cos(x)) ^2 = 1

Answer 4

solved it. trick question sorry.
Pythagorean identity

1+tan^2x=sec^2x

Answer 5

simplify the left hand term

Answer 6

already did the answer.
its the same thing.

Answer 7

ok but i was solving in different term ...