x^2/(sin根2+sin根3)+y^2/(cos根2+cos根3)=1表示什么养的曲线 要原因

3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? 化简sin(2x-y)*sin y+cos(2x-y)*sin y 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^2(x)]*[sin^2(x)]求导 sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值 化简 1/2cos x-根号3/2sin x 根3sin x+cos x sin x=sin（45+x）×（根2÷3）sin x=sin（45-x）×（根2÷3） 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) y＝sin(^2)X 还有 y＝sin(^3)(X/2) (cosx)^2-(cosy)^2=1/3求sin(x+y)*sin(x-y). 如果 2sin(x-y)=sin(x+y),证明 tanx= 3 tany sinx=1/3,sin(x+y)=1,求sin（2y+x）=? 已知sinx=1/3,sin(x+y)=1,则sin（2y+x)= siny=1/3,sin(x＋y)=1,求sin(2x＋y) 判断单调性 y=sin(x-π/6) y=sin(-2x+π/3) y =(cos^2) x - sin (3^x),求y' sin^2(x+y)-cos(x+y)sin(x+y)-3cos^2(x+y)的值急用 求y=sin[sin(x^2)]的导数