50994304
花朵
共回答了22个问题采纳率:95.5% 举报
2(1/2*sinX-根号3/2*cosX)
=2(sin派/3*sinX-cos派/3*cosX)
=2(X-派/3)
这个你要把公式记住
sin(a+b)=sin(a)cos(b)+cos(α)sin(b)
cos(a+b)=cos(a)cos(b)-sin(a)sin(b)
sin(a-b)=sin(a)cos(b)-cos(a)sin(b)
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
tan(a+b)=(tan(a)+tan(b))/(1-tan(a)tan(b))
tan(a-b)=(tan(a)-tan(b))/(1+tan(a)tan(b))
给你找了一点,你看看吧
1年前
4