y=2sin(x-π/4)cos(x+π/4)+1化简

函数y=sin(x)cos(x+ π/4)+cos(x)sin(x+π/4)的最小正周期是 y=2cos(x/4+ π/3)-3sin(x- π/4)y=sin(4x- π/3)-cos(3x+π/2) y=(sin x + COS x)^2 已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 y=2cos x (sin x+cos x) 求函数y=cos(9/2π+x)+sin^2x的最大值和最小值还有一题 已知sinx+cosx=1/2,求sin^3x+cos^3x和sin^4x+cos^2x y=2sin(x-π/4)cos(x+π/4)+1化简 y=sin(2x-π/4)+cos(3x+π/3)的导数 y=sinπx+cosπx的周期 y=√2sin(2x+π／4)-1/2cos²x 化简~急用~ sin(x+y)sin(x-y)=k,求cos^2x-cos^2y sin(x+y)cosx+cos(x+y)sinx=1/3 x∈(3π/2,2π) 求cos(2x+π/4) 确定下列函数的定义域1）y=√[lg(cos x)]2) y={tan[x-π/4)]*√(sin x)}/lg(2cos x-1) 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). 证明COS（X+Y）COS（X-Y）=COS^2X-SIN^2Y 证明cos(x+y)cos(x-y)= cos^2(x)-sin^2(y) 求函数y=sin^4x+cos^4x,x(0,π/6)的最小值 化简:y=2sinxsin(x-π/2)+cos²x-sin²x