化简cos（X-30°）+sin(X+30°)+cosX+1

化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 化简（1)√3sin x+cos x (2）√2(sin x-cos x) （3）√2cos x-√6sin x cos x/sin x+sin x/(1+cos x) 化简. sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少? 化简：sin（x+60°）+2sin（x-60°）-√3cos（120°-x）= 化简：sin(x-2派）cos(x+派）tan(x-99派）/cos(派-x)sin(3派-x)sin(-x-派） 化简 1/2cos x-根号3/2sin x 根3sin x+cos x 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4 sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) ? sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 化简sin(x+7π/4)+cos(x-3π/4）步骤我已经找到撒sin(x+7π/4)+cos(x-3π/4)=sin(x+2π-π/4)+cos(x-π+π/4)我问下这一步是在干嘛?=sin(x-π/4)+cos[-(π-x-π/4)]=sin(x-π/4)+cos(π-x-π/4)=sin(x-π/4)-cos(x+π/4)=sin(x-π/4)-cos(x+π/2- 化简cos（X-30°）+sin(X+30°)+cosX+1 若f(cos x)=cos 3x ,那么f(sin 30°）的值为 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x