化简：（2cos²α-1）/[2tan((π/4)- α)]*{cos³[(π/4)- α],

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化简：（2cos²α-1）/[2tan((π/4)-α)]*{cos³[(π/4)-α],化简：（2cos²α-1）/[2tan((π/4)-α)]*{cos³

化简：（2cos²α-1）/[2tan((π/4)- α)]*{cos³[(π/4)- α],
化简：（2cos²α-1）/[2tan((π/4)- α)]*{cos³[(π/4)- α],