求∫(π/4,π/2) x/sin^2xdx的过程,

求f【x】=2sin[x+π/4]sin[x-π/4]+sin2x的最大值 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 求极限：sin x^tan x(x→π/2) 2sin(x+π/4)sin(x-π/4)=? 求x趋于2,3,4,n时(x-x^3)/sinπx的极限, sin^2(π/4 +x) 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin 求sin^2(2x+π/3)的导数这样写为什么不对：[sin^2(2x+π/3)]'=[sin(2x+π/3)·sin(2x+π/3)]'=2[sin(2x+π/3)]'·sin(2x+π/3)=2cos(2x+π/3)·sin(2x+π/3)=sin(4x+2π/3) 求∫sin^2(x)[sin^4(x)+ln(3+x)/(3-x)]dx在[-π/2,π/2]上的定积分^表示次幂 求sin(π/2+2x)=2sin(π/4+x)cos(π/4+x)的化简过程 已知sin(x+π/3)=1/4,求sin(2π/3-x)+cos²(π/6-x) 求f(x)=2sin(x+π/4)sin(x-π/4)+sin2X的最大值.（答案是根号2, 求f(x)=2sin(x+4分之π)sin(x-4分之π)+sin2x的最大值 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). 求下列函数周期 y=3sin(x/4) x属于Ry=2sin(2x-π/6) 求X解集：sinx=2sin(π/3-x) 求微积分 ∫sin^2(x)cos^4(x) dx 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)