三角函數的誘導公式六個?誘導公式 sin(-a) = -sin(a) ，現在小編就來說說關于三角函數的誘導公式六個?下面内容希望能幫助到你，我們來一起看看吧!
誘導公式
sin(-a) = -sin(a)
cos(-a) = cos(a)
sin(π/2-a) = cos(a)
cos(π/2-a) = sin(a)
sin(π/2 a) = cos(a)
cos(π/2 a) = -sin(a)
sin(π-a) = sin(a)
cos(π-a) = -cos(a)
sin(π a) = -sin(a)
cos(π a) = -cos(a)
tgA=tanA = sinA/cosA
萬能公式
sin(a) = [2tan(a/2)] / {1 [tan(a/2)]²}
cos(a) = {1-[tan(a/2)]^2} / {1 [tan(a/2)]²}
tan(a) = [2tan(a/2)]/{1-[tan(a/2)]^2}
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