- #1
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Does someone know of a website that has proofs for most basic trigonometry identities?
for sin(x+y), cos(x+y), sin(2x), cos(2x), tg²x + 1 = sec²x, etc
thanks!
for sin(x+y), cos(x+y), sin(2x), cos(2x), tg²x + 1 = sec²x, etc
thanks!