化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3

化简cos 2x 证明cos 2x cos x=1/2(cos x+cos 3x) 化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x) sin x cos x cos 2x 化简 化简f(x)=2cos^3 x+sin^2 (360-x)-cos(180-x)-3 / 2+2cos^2(180+x)+cos(-x)求化简图片 2cos(x+y)cosx-cos(2x+y)化简 cos(-x-2π) 和cos(π-x) 化简 cos（x-2派/3)=-cos(x+派/3) 求不定积分cos(3x)cos(2x) 化简tan(3x/2)-tan(x/2)-sinx/(cos(3x/2)*cos(x/2)) 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 化简 1/2cos x-根号3/2sin x 根3sin x+cos x (cos(x))^-2导数 cos(x^2)dx cos x>-1/2 化简 根号3sinXcosX+cos*2X 化简：cos4x*cos2x-cos^2*3x