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thu07102010


giup dum may bai luong giac
sin ^3 x *cos3x +cos^3 * sinx = sin^3 x
sinx *cos4x - sin^2 2x = 4 sin^2 (pi/4 -x/2) -7/2
sin ^3 x *cos3x +cos^3 * sinx = sin^3 x
sinx *cos4x - sin^2 2x = 4 sin^2 (pi/4 -x/2) -7/2
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