诱导公式:
sin x=sin(x+2π) cos x=cos(x+2π)tan x=tan(x+2π)
sin x=-sin(x+π) cos x=-cos(x+π) tanx=tan(x+π)
sin x=sin(x-π) cosx=-cos(x-π) tanx=-tan(x-π)
sin x=-sin(-x) cosx=cos(-x) tanx=-tan(-x)
sin(x+½π)=cos x cos(x+½π)=-sin x
sin(½π-x)=cos x cos(½π-x)=sin x
三角恒等变换
cos(x+y)=cos x · cos y-sin x· sin y
cos(x-y)=cos x · cos y+sin x· sin y
sin(x+y)=sin x · cos y+cos x · sin y
sin(x-y)=sin x · cos y-cos x · sin y
tan(x+y)=(tan x+tan y)/(1-tan x · tan y)
tan(x-y)=(tan x-tan y)/(1+tan x · tan y)
二倍角
sin 2x=2 sin x · sin y
cos 2x=cos² x-sin² x=1+2cos² x=1-2sin² x
tan 2x=2 tan x/(1-tan² x)
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