s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)用matlab画图,求教啊

s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)用matlab画图,求教啊 傅里叶级数作图f（x）=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]我用mathematica输入程序Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3si S(1-sin^2x)d(sinx)为什么=sinx-1/3sin^3x? 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x sin(x^2)/sin^2x 求导 y=[sin^2(x)]*[sin^2(x)]求导 2sin(x+π/4)sin(x-π/4)=? ∫sin(6x)sin(2x)dx=? 解方程 sin 2x + sin x = 0 Sin2x=sin^2x S (sin 5x) (sin 3x) dx = 化简sin(-2x) lim(x(sin)^2) sin^2(x)求导 sin(2x)积分 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) 证明一个sin&cos的等式证明 1+sin^2(x)+sin^4(x)+sin^6(x)=[1-sin^8(x)]/[cos^2(x)] 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=?