cho `tanalpha=2` Tính:  `P=(sinalpha+3cosalphasin^2alpha)/(cos^3alpha+2sinalpha)-cos^2alpha/(1+sin^2alpha)`

cho `tanalpha=2` Tính:  `P=(sinalpha+3cosalphasin^2alpha)/(cos^3alpha+2sinalpha)-cos^2alpha/(1+sin^2alpha)`
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