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cos 2x =
cos^{2} x − sin^{2} x

sin^{2} x =
1/2 (1 − cos 2x)

cos^{2} x =
1/2 (1 + cos 2x)

sinAcosB =
1/2 [sin (A − B) + sin(A + B)]

sinAsinB =
1/2 [cos(A − B)−cos(A + B)]

cosAcosB =
1/2 [cos(A − B)+cos(A + B)]

sin^{2} x =
1 − cos^{2} x

sec^{2} x =
1 + tan^{2} x

csc^{2} x =
1 + cot^{2} x

cos^{2} x =
1 − sin^{2} x

tan^{2} x =
sec^{2} x − 1

cot^{2} x =
csc^{2} x − 1

