把cos^2 x+cos^2 (2派/3-x)化简成单角
f(x)=cos(2x-派/3)-2sin x*cos (派/2+x)
cos(3/2派+x)=?
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
求(sin(派-x)cos(3/2派-x)tanx)/(cos(2派-x)cot(x-派/2)sin(派/2-x))
sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
已知cos(x-派/4)=3/5,x(派/2,3派/4)
已知f(x)cos(2x-派/6)-cos(2x+派/6)+2cosx平方
.若f(x)={sin(n派-x)cos(n派+x)/cos[(n+1)派-x]}*tan(x-n派)cot[(n派/2
sin(x/2+派/6)=1/2,求cos(x+派/3)
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
若cos(派+x)=-根号3/2,且x属于(-派,派),则x=