【托馬斯微積分學(xué)習(xí)筆記】函數(shù) -- 三角函數(shù)
基礎(chǔ)三角函數(shù):

一些二級(jí)結(jié)論:
sin2x + cos2x = 1.
1 + tan2x = sec2x?
1 + cot2x?= csc2x
cos(A + B) = cos Acos B - sin Asin B
sin (A + B) = sin Acos B + cos Asin B
cos2x = cos2x - sin2x
sin2x = 2 sin x * cos x
cos2x = (1 + cos2x) / 2
sin2u = (1 - cos2x) / 2?
c2?= a2?+ b2?- 2ab * cos x

正弦函數(shù)通式


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