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trigonometry how to prove that: sin 2x = 2 sinx cosx

trigonometry
how to
prove that:
 sin 2x =  2 sinx cosx

Grade:11

1 Answers

Mehdi Alam
13 Points
5 years ago
sin(x+y)=sinx.cosy+cosx.siny,if we put x=y, then, Sin(x+y)=sin(2x)&=sinx.cosy+cosx.siny=sinx.cosx+cosx.sinx =2sinx.cosx£, sin(2x)=2sinx.cosx

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