2cos x (sin x -cos x)+1
2cos x (sin x -cos x)+1
化简 1/2cos x-根号3/2sin x 根3sin x+cos x
sin(1/x)-cos(1/x)/x
cos 2x /sin^2 x*cos^2 x不定积分
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
lim(sin(x^2*cos(1/x)))/x怎么做?
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)
(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?
已知f(x)=sin(x/2) + cos(x/2) +[cos(x/2)]^2-1/2
化简f(x)=2cos(x/2)·(sin(x/2)+cos(x/2))-1