How do you prove: $2sinx = cosx$ ?

Question

3946 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-03-09T14:33:03

This can not be proven since it is not (in general) true.

As an obvious counter example:
If $x=0$
then $sin(x)=0$ and $cos(x)=1$
and obviously $2 * sin(x) != cos(x)$

Perhaps (?) you wanted to solve for $x$ given this equation.

How do you prove: 2sinx = cosx2sinx = cosx?