2tan(派/4-X)SIN^2(派/4+X)化简
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)
已知A=(2cos^2x-1)/[(tan(派/4)-x)(sin^2(派/4)+x)]
化简tan(3派-a),sin(a-5派),tan(a-3派/2),cos(8派-a),sin(-a-4派)
f(x)=sin(派-x)cos(2派-x)/sin(派/2+x)tan(派+a) 求f(31派/3)
已知sinx=-5/13,x属于(派,3派/2),求sin(x-派/4)
求证:tan(x/2+派/4)+tan(x/2-派/4)=2tanx
.若f(x)={sin(n派-x)cos(n派+x)/cos[(n+1)派-x]}*tan(x-n派)cot[(n派/2
(cot(a+4派)cos(a+派)sin^2(a+3派))/(tan+(派+a)cos^3(-派-a))
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)
函数f(x)=sin(2x+派/4)+cos(2x+派/4)