Sin(x/2)+cos(x/2)为什么等于根号2倍sin(x/2+派/4)?
sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
已知函数f(x)=2根号3sin(x/2+派/4)cos(x/2+派/4)-sin(x+派).求f(x)的最小正周期
已知函数f(x)=sinx平方+2倍根号3sin(x+派/4)cos(x-派/4)-cosx平方-根号3.
已知函数f(x)=2根号3sin(x/2+派/4)cos(x/2+派/4)-sin(x+派).
证明sin x+cos x的最大值等于 根号2
f(x)=cos(2x-派/3)-2sin x*cos (派/2+x)
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
已知sin X+cos X=m,|m|小于等于根号2且|m|不等于1,求sin X^3+cos X^3,sin X^4+
函数f(x)=sin(2x+派/4)+cos(2x+派/4)
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)
已知函数f(x)=sin^2(x/2+派/12)+根号3sin(x/2+派/12)cos(x/2+派/12)-1/2.(