化简:2cos^4x-2cos^2x+1/2 /2tan(π/4-x)sin^2(π/4+x)
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化简:2cos^4x-2cos^2x+1/2/2tan(π/4-x)sin^2(π/4+x)化简:2cos^4x-2cos^2x+1/2/2tan(π/4-x)sin^2(π/4+x)化简:2cos^
化简:2cos^4x-2cos^2x+1/2 /2tan(π/4-x)sin^2(π/4+x)
化简:2cos^4x-2cos^2x+1/2 /2tan(π/4-x)sin^2(π/4+x)
化简:2cos^4x-2cos^2x+1/2 /2tan(π/4-x)sin^2(π/4+x)
分母=2tan(π/4-x)*cos^2[π/2-(π/4+x)] =2[sin(π/4-x)/cos(π/4-x)]*cos^2(π/4-x) =2sin(π/4-x)cos(π/4-x) =sin[2(π/4-x)] =sin(π/2-2x) =cos2x 分子=1/2[4cos^4(x)-4cos^2(x)+1] =1/2(2cos^2x-1)^2 =1/2(cos2x)^2 所以原式=1/2(cos2x)^2/cos2x=1/2*cos2x
化简cos 2x
cos x>-1/2
证明cos 2x cos x=1/2(cos x+cos 3x)
化简f(x)=cos(-x/2)+cos(4k+1/2-x/2)
化简1+sin x/cos x·sin2x/2cos²(π/4-x/2)
化简sin^4x+cos^2x
化简sin(x)cos(x)cos(2x)
化简sin(x)cos(x)cos(2x)
sin x cos x cos 2x 化简
化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x)
2cos x (sin x -cos x)+1
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求解三角函数 cos 2 X (1 - 2 sin ^2 2 X) + cos 4 X ( 1 + cos 2 X)cos 2 X (1 - 2 sin ^2 2 X) + cos 4 X ( 1 + cos 2 X) = cos 2 X cos4X (1 + cos 2 X) = cos 4 X (1 +2cos 2X) = 0
化简2cos^4x-2cos^2x+1/2如题.急.
化简y=(2cos^4x-3cos^2x+1)/cos2x
2cos(x+y)cosx-cos(2x+y)化简
cos 2x(1-2sin^2 2x) + cos 4x (1+cos 2x)=
cos(-x-2π) 和cos(π-x) 化简