y＝(sin x)＋cos

y＝(sin x)＋cos 参数方程x＝cosθ(sinθ+cosθ)y＝sinθ(sinθ+cosθ) 已知函数y＝sin²x＋sin2x＋3cos²x.求 函数y＝lg(sin x)＋cos x－12的定义域为多少? 化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y) 函数y=(sin x+cos x)平方＋2sin平方x sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 证明COS（X+Y）COS（X-Y）=COS^2X-SIN^2Y 化简sin(2x-y)*sin y+cos(2x-y)*sin y 圆的参数方程x＝3sinθ＋4cosθ y＝4sinθ－3cosθ此圆的半径是多少 Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)