证明:sin(π/4-x)=cos(π/4+x)
证明:sin(π/4-x)=cos(π/4+x)
证明下列恒等式: (1)2sin(2/π+x)cos(2/π-x)*cosθ+(2cos^2x-1)*sinθ=sin(
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
证明∫( 0,π/2 ) (f sin x/(f sin x+f cos x) dx=π /4
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
[(sin x-cos x)/(sin x+cos x)]^4 求定积分 积分区间0-π/4
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
两个个数学证明题1.证明:cos2x+sin2x=√2sin(sin2x+π/4)2.证明:αsinαx+cosαx=√
已知函数f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)=sin(2x-π/6) ,
函数y=【cos(3x+π/4)-sin(3x+π/4)】/[cos(3x+π/4)+sin(3x+π/4)]的定义域,
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x