概要:所谓三角函数诱导公式,就是将角n·(π/2)±α的三角函数转化为角α的三角函数。sin(-α) = -sinαcos(-α) = cosαtan (—a)=-tanαsin(π/2-α) = cosαcos(π/2-α) = sinαsin(π/2+α) = cosαcos(π/2+α) = -sinαsin(π-α) = sinαcos(π-α) = -cosαsin(π+α) = -sinαcos(π+α) = -cosαtanA= sinA/cosAtan(π/2+α)=-cotαtan(π/2-α)=cotαtan(π-&alph
三角函数诱导公式及记背诀窍,标签:高二数学课本|基础知识|教案,http://www.51jxk.com所谓三角函数诱导公式,就是将角n·(π/2)±α的三角函数转化为角α的三角函数。
sin(-α) = -sinα
cos(-α) = cosα
tan (—a)=-tanα
sin(π/2-α) = cosα
cos(π/2-α) = sinα
sin(π/2+α) = cosα
cos(π/2+α) = -sinα
sin(π-α) = sinα
cos(π-α) = -cosα
sin(π+α) = -sinα
cos(π+α) = -cosα
tanA= sinA/cosA
tan(π/2+α)=-cotα
tan(π/2-α)=cotα
tan(π-α)=-tanα
tan(π+α)=tanα
三角函数诱导公式记背诀窍:奇变偶不变,符号看象限