若cos2x/sin(x-π/4)=-根号2/2,sin2x=?
sin2x+cos2x+2=根号2倍的sin(2x+π/4)+2怎么出来的,
化简:2cos2x+2sin^2 x+cos(-x)分之sin2x+sin(π-x)=___________
f(x)=(负的根号3)乘于cos2x-sin2x,是否会等于f(x)=-2sin(2x+π/3)?
sin2x/3+cos2x/3=√2sin(2x/3+π/4) 求其化简过程
若(cos2x)/[sin(x-π/4)]=(-根号2)/2,则cosx+sinx=?
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
已知tanx=-4/3,试化简(2+cos2x)/[(根号2)·cos(x-π/4)-sin2x]
高中数学辅助角公式根号3/2*COS2x-1/2sin2x=-sin(2x-π/3)怎么得来的
根号2*sinx=sin2x+cos2x 求x
已知函数f(x)=根号3sin2x+cos2x+2
两个个数学证明题1.证明:cos2x+sin2x=√2sin(sin2x+π/4)2.证明:αsinαx+cosαx=√
x为第二象限角,sinx=根号15/4求sin(x+π/4)/sin2x+cos2x+1的值