[tex]\displaystyle\bf\\1)\\\\3-6Sin^{2} x=3\cdot\underbrace{(1-2Sin^{2} x)}_{Cos2x}=3Cos2x\\\\2)\\\\10Sinx Cosx=5\cdot\underbrace{2Sinx Cosx}_{Sin2x}=5Sin2x[/tex]
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[tex]\displaystyle\bf\\1)\\\\3-6Sin^{2} x=3\cdot\underbrace{(1-2Sin^{2} x)}_{Cos2x}=3Cos2x\\\\2)\\\\10Sinx Cosx=5\cdot\underbrace{2Sinx Cosx}_{Sin2x}=5Sin2x[/tex]