Question

Which of the following equations are identities?
A) sin^2 x - cos^2 x = 1
B) tan^2 x - sec^2 x -1
C) sin^2 x = 1 - cos^2 x
D) cot^2 x + csc^2 x = 1

Answer 1

Will medal!

Answer 2

Always remember

\[\large sin^2(x) + cos^2(x) = 1\]

you can derive any other identities from that

Answer 3

\[\sin ^2x+\cos ^2 x=1 ......(1)\]
rearrange and find the solution.
divide each term of (1) by \[\sin ^2x\] and rearrange
again divide each term of (1) by \[\cos^2 x\] and rearrange

Answer 4

divide..?