y=sin(x+10°)+cos(x+40°)的最大值

函数Y=4cos(x-20°)+3sin(x+10°)的最大值 y=(sin x + COS x)^2 y=2cos x (sin x+cos x) 化简y=sin^4x-cos^4x, y=sin^4x+cos^4x的值域 化简sin (x+y)sin x +cos (x+y)cos x= sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 函数y=cos^4x-sin^4x的最小正周期y=(cos^2x+sin^2x)(cos^2x-sin^2x)为什么等于cos^2x-sin^2x=cos2x谢谢 函数y=sin(x)cos(x+ π/4)+cos(x)sin(x+π/4)的最小正周期是 y=4√2sin x cos x+cos 2x 的值域是 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) 6-4x-x^2=5/|sin(y/x)cos(y/x)|的解 求函数y=7-4sin(x)cos(x)+4cos^2(x)-4cos^4(x)值 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) y=(sin(x)-1)/(cos(x)+(cos(x))/(sin(x)+1)的奇偶性 y=Sin x +Cos x + Sin x * Cos x 的值域是多少? y = (cos x - sin x ) / ( cos x + sin x) 的最小正周期