化简2sin(派/2-x)×sin(派/4+x),
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
函数f(x)=sin(2x+派/4)+cos(2x+派/4)
f(x)=sin(派-x)cos(2派-x)/sin(派/2+x)tan(派+a) 求f(31派/3)
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
已知sinx=4/5,x属于(派/2.派)求sin(2x+派/4)的值
已知COS(X+派/4)=根号2/10,x属于(派/2,3派/4) 求sinx 求sin(2x+派\4)
cos(2x+派/2)=sin(2x)?
sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
已知sinx=-5/13,x属于(派,3派/2),求sin(x-派/4)
高一数学 已知函数f(x)=2sinxcos(派/2-x)-根号3*sin(派+x)cosx+sin(派/2+x)cos
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)