cos(3派-x)-3cos(x+2分之派)=0,求tanx
求(sin(派-x)cos(3/2派-x)tanx)/(cos(2派-x)cot(x-派/2)sin(派/2-x))
已知tanx =根号3/3,求sinx+cos(派+x)/sinx+sin(派/2-x)的值
已知2tanx乘以sinx=3,-二分之派小于x小于0,则cos(x-六分之派)等于
cos(3/2派+x)=?
f(x)=sin(派-x)cos(2派-x)/sin(派/2+x)tan(派+a) 求f(31派/3)
f(x)=cos(2x-派/3)-2sin x*cos (派/2+x)
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
sin(x/2+派/6)=1/2,求cos(x+派/3)
已知cos(x-派/4)=3/5,x(派/2,3派/4)
已知cos(x-派/4)=根号2/10,x属于(派/2,3派/4)求sinx的值
已知Cos(x-派/4)=根号2/10,x属于(派/2,3派/4)求sinx的值.
求y=cos(x-8分之派)x属于(6分之派,三分之2派)的最小值,