tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 順便問(wèn)一下. tan,sin,cos是什么意思?
tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 順便問(wèn)一下. tan,sin,cos是什么意思?
數(shù)學(xué)人氣：238 ℃時(shí)間：2020-03-25 02:46:29
優(yōu)質(zhì)解答
tan,正切；sin,正弦；cos,余弦tan(x+y)tan(x-y)=sin(x+y)/cos(x+y) * sin(x-y)/cos(x-y)=sin(x+y)sin(x-y) / [cos(x+y)cos(x-y)]=(sinxcosy+cosxsiny)(sinxcosy-cosxsiny) / [(cosxcosy-sinxsiny)(cosxcosy+sinxsiny...
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