判定y=sin(x/2)+sin(x/5)是周期函数吗

判定y=sin(x/2)+sin(x/5)是周期函数吗 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 求证sin²x-sin²y=sin(x+y)sin(x-y) 求y=sin[sin(x^2)]的导数 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? y=12sin(2x+π/6)+5sin(π/3-2x)最大值 y=12sin(2x+π/6)+5sin(π/3-2x)的最大值 y=3sin(2x+10)+5sin(2x+70)最大值 函数y=sinx+2sin^3 x+3sin^5 x的最小正周期 matlab中一些新手问题,syms x y;y =ezplot('1/5*(-2-5/(-125+100*sin(x))*(-20*sin(x)+40+10*(-121*sin(x)^2-100*sin(x)+121+100*sin(x)^3)^(1/2))+5/2*sin(x)/(-125+100*sin(x))*(-20*sin(x)+40+10*(-121*sin(x)^2-100*sin(x)+121+100*sin(x)^3)^(1/2)))*cos(x) sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 证明sin(x+y)sin(x-y)=sinx-siny y =sin(2x-1)求导! y=sin(2x+a)(0 y=|sin 2x| 周期 y=e^[(sin^2)x]求导!