特殊三角函數(shù)數(shù)值表(編輯修改稿)
2025-07-27 23:28 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ) sin(π/2a) = cos(a) cos(π/2a) = sin(a) sin(π/2+a) = cos(a) cos(π/2+a) = sin(a) sin(πa) = sin(a) cos(πa) = cos(a) sin(π+a) = sin(a) cos(π+a) = cos(a) tgA=tanA = sinA/cosA 萬(wàn)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} asin(a)+bcos(a) = [√(a^2+b^2)]*sin(a+c) [其中，tan(c)=b/a] asin(a)bcos(a) = [√(a^2+b^2)]*cos(ac) [其中，tan(c)=a/b] 1+sin(a) = [sin(a/2)+cos(a/2)]^2。 1sin(a) = [sin(a/2)cos(a/2)]^2。這是高考用的正割函數(shù)與余割
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