Question

Question #23c32

Answer 1

See below

Explanation:

When providing trigonometric proofs, it is wise to start from the side which looks less complicated to solve. In this case, the RHS looks easier to solve.

`sin2xcotx-2sin^2x=2cancel(sinx)cosxcosx/cancel(sinx)-2sin^2x=`
`2cos^2x-2sin^2x=2(cos^2x-sin^2x)=2cos2x` ΟΕΔ