Question

to prove L.H.S=R.H.S

Answer 1

= sec² A / 2 tanA

= ( 1/cos² A ) / ( 2 sinA/cosA )

= (1/cos² A )× (cos A/2 sinA )

= 1/( 2 sinA cosA)

= 1/ sin2A

= cosec2A

= RHS

I hope this helps you.

: )