(2^50 ) (x^2 ) sin (2x+50π/2) 为什么等于 2^5(2^50 ) (x^2 ) sin (2x+50π/2) 为什么等于 2^50(- x^2 sin 2x)

sin(x^2)/sin^2x 求导 化简sin(-2x) lim(x(sin)^2) sin^2(x)求导 sin(2x)积分 sin(x/2+50)=30 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x) 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 x*（1+sin^2 x )/sin^2x 不定积分 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x (1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1) sin^2(π/3-x)+sin^2(π/6+x)