2sin^2x-cos^2x+sinxcosx-6sinx+3cosx=0,x属于 0 到 2分之派,求X^2 是2次方的意思sin^2x 即 sinx的平方

下列等式中,成立的是A.sin﹙π／2－x﹚＝cos﹙π／2－x﹚B sin﹙2π＋x﹚＝﹣sinxC sin﹙x＋2π﹚＝sinxD cos﹙π＋x﹚＝cosx 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 2cos x (sin x -cos x)+1 y=2cos x (sin x+cos x) 化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x) sin x cos x cos 2x 化简 (sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x? 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x) 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x sin(x/2)cos(x/2)= 化简sin^4x+cos^2x sin[cos^2(x^3+x)],求导 y=(sin x + COS x)^2