Question

Verify cscAsecA = 2csc2A

Answer 1

look at the right hand side

2csc(A)

so you have

\[2 \times \frac{1}{\sin(2A)}\]

and sin(2A) = 2sin(A)cos(A)

make the substitution and you get

\[2 \times \frac{1}{2ins(A)\cos(A)}...or.... \frac{2}{2\sin(A)\cos(A)}\]

hope this helps... there is still a little work to do

cancelling the common factor...

and then simplifying