Question

sin^2x -1 = cos^2x

Answer 1

cos^2 x = 1 -sin^2 x

Answer 2

not usually

Answer 3

sin^2 x - 1 = 1 - sin^2 x

2 sin^2 x = 2

sin^2 x = 1

sin x = 1
or
sin x = -1

Answer 4

x = 90

x = 270

Answer 5

Do you understnad?

Answer 6

how is it 270 degrees tho?

Answer 7

you get two equations from sin^2 x = 1 when you square root both sides
sin x = 1
sin x = -1

Answer 8

ok nvm i think i know why :P

Thankks