cos^2 (x/2-7/8π)-cos^2(x/2+7π/8)可化简为?
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cos^2 (x/2-7/8π)-cos^2(x/2+7π/8)可化简为?
化简cos²(x/2-7π/8)-cos²(x/2+7π/8)
cos^2 π/8+cos ^2 3π/8+ cos^2 5π/8+cos^2 7π/8=?
cos(-x-2π) 和cos(π-x) 化简
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
求函数y=cos^2(x/2-7π/8)-cos^2(x/2+7π/8)的最大值
化简cos 2x
(cos(x))^-2导数
cos(x^2)dx
cos x>-1/2
证明cos 2x cos x=1/2(cos x+cos 3x)
化简函数y=cos^2(x+7π/12)-cos^2(x+π/12),
求函数y=7-4sin(x)cos(x)+4cos^2(x)-4cos^4(x)值
化简根号下[(1-cos x)/(1+cos x)] + 根号下[(1+cos x)/(1-cos x)]其中x属于(π/2,π)
证明:函数f(x)=cos^2+cos^2(x+π/3)+cos^2(x-π/3)是常数函数
0.5-cos^2(π/8)
若函数f(x)=[2cos^3 x-sin^2 (x+π)-2cos (-x-π)+1]/[2+2cos^2(7π+x)+cos(-x)],(1)求证f(x)是偶函数若函数f(x)=[2cos^3 x-sin^2 (x+π)-2cos (-x-π)+1]/[2+2cos^2(7π+x)+cos(-x)],(1)求证f(x)是偶函数 (2)求f(π/3)的值
2cos x (sin x -cos x)+1