1.sin(π/4+x)*sin(π/4+x)-cos(π/4+x)*cos(π/4+x)2.cosα*cos(α+β)-sin(α+β)*sinα3.cos(α-β)*cos(β-ν)-sin(α-β)*cos(β-ν)

sin(x+π/4) 2sin(x+π/4)sin(x-π/4)=? sin(x+π/4)sin(x-π/4)等于什么? sin^2(π/4 +x) 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). f(x)=（1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题, 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 根号2sin(x+π/4)化简 sin(x+π/4)等于多少 sin（x+π）的奇偶性sin(x+π)的奇偶性sin(x+π/2)的奇偶性sin(x+π/4)的奇偶性 sin(阿尔法-π/4) sin(-π/4)求值 f(x)=sin²(x+π/4)-sin²(x-π/4)是 函数f(x)=2sin(x+π/4)sin(x-π/4)+sin2x的值域 求f【x】=2sin[x+π/4]sin[x-π/4]+sin2x的最大值 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 定积分0到π x*((sin(x))^2-(sin(x))^4)^(1/2)