y=√2sin(2x+10°)+cos(2x+55°)的最值
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
设sin(x+y)sin(x-y)=m,则cos^2x-cos^2y的值
已知0≤∠A≤180°,x=sinα,y=cosα,求:(1)f(x)=x²+x+1的最值(2)g(x)=y&
求函数y=cos^2x-sin^2-√3cos(3π/2+2x)+1的周期,单调减区间和最值
已知cos^2x-cos^2y=根号3/2,则sin(x+y)·sin(x-y)的值
求Y=SIN平方X+3COS平方X+2SINXCOSX的最值和最小正周期
2sin^2x+cos^2y=1,求sin^2x+cos^2y的取值范围
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
设X∈(0,3/π),闭区间,求函数y=cos(2x-3/π)+2sin(x-6/π)的最值
已知函数y=(sin x+ cos x)(sin x+cos x)+2cos x*cos x ,求它的递减区间