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Product to sum cos x cos
(1/2)[cos(a-b)+cos(a+b)]
Product to sum sin x sin
(1/2)[cos(a-b)-cos(a+b)]
Product to sum sin x cos
(1/2)[sin(a+b)+sin(a-b)]
Pythagorean tan and sec
Tan^x+1=sec²x
Pythagorean sin and cos
Sin²x+cos²x=1
Trig Identities
A²-x² = (a/b)sinx
A²+x²= (a/b)tanx
X²-a²= (a/b)secx