y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解

y=[sin^2(x)]*[sin^2(x)]求导 一道三角恒等式证明题请证明sin(x+y)sin(x-y)=sin^2(x)-sin^2(y) y=(sin x + COS x)^2 求y=sin[sin(x^2)]的导数 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? sin(x+y)sin(x-y)=k,求cos^2x-cos^2y y =sin(2x-1)求导! y=sin(2x+a)(0 y=|sin 2x| 周期 y=e^[(sin^2)x]求导! y=sin(2x+a)（0 tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,cos是什么意思? 证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+y)/2) 已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 化简sin(2x-y)*sin y+cos(2x-y)*sin y 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) y=x^2*sin(x^2-x-2),-2 求导：y=x-sin(x/2)cos(x/2).