化简:2sin^4x+3\4sin^2(2x)+5cos^4x-1\2(cos4x+cos2x)

化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 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 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x (1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x 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 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 化简sin^4x+cos^2x 化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x) f(x)=cos(2x-x/3)+2sin(x-π/4)sin(x+π/4)sin(x+π/4)化简. sin^8X+cos^8X+4sin^2Xcos^2x-2sin^4xcos^4X(化简） 化简【完整步骤!】1.（sin^4x-sin^2x）/secx2.sin^4x-cos^4x【这道题的正确答案是sin^2x-cos^2x】 三角等式求证：cos^6x+sin^6x=1-3sin^2x+3sin^4x 2sin(x+π/4)sin(x-π/4)=? sin^2(π/4 +x) 泰勒公式的为什么㏑( 1 + sin X ) = sin X - ( sin X )²/2 +(sin X )³ /3 -(sin X )∧4 + o (sin ∧4 X ),完全不理解, 化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)