sin^2 + cos^2 = 1
so
sin^2 = 1 - cos^2
so here
1 - cos^2 - cos^2 = .......
How does:
sin^2(x) - cos^2(x) = 1 - 2cos^2(x)
1 answer
sin^2(x) - cos^2(x) = 1 - 2cos^2(x)
1 answer
0 answers
1 answer
3 answers
1 answer