sin(x- 3π/4)cos(x- π/4)=—1/4 求cos4x
已知sin(x-π/4)cos(x-π/4)=-1/4,求cos4x的值.
已知sin(x-135)cos(x-45)=-1/4,求cos4x
sin(x-3兀/4)cos(x-兀/4)=-1/4,求cos4x
已知SIN^4x+cos^4x=5/8 求 cos4x?
已知sin(x-0.75π)*cos(x-0.25π)=-0.25,求cos4x的值
已知函数f(x)=cos4x-1除2cos(2x+π/2)+cos²x-sin²x 求函数f(x)的
(2010•泰安一模)已知函数f(x)=4cos4x−2cos2x−1sin(π4+x)sin(π4−x)
已知函数f(x)=(cos4x-1)/(2cosπ/2+2x)+cos∧2x-sin∧2x.
已知函数f(x)=(cos4x-1)/(2cosπ/2+2x)+cos∧2x-sin∧2x,求函数f(x)的定义域和值域
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
[(sin x-cos x)/(sin x+cos x)]^4 求定积分 积分区间0-π/4