[tex]\displaystyle\bf\\\frac{Sin2\alpha }{Sin\alpha } =\frac{2Sin\alpha Cos\alpha }{Sin\alpha } =2Cos\alpha[/tex]
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[tex]\displaystyle\bf\\\frac{Sin2\alpha }{Sin\alpha } =\frac{2Sin\alpha Cos\alpha }{Sin\alpha } =2Cos\alpha[/tex]