Question

How do you verify `tan(A/2)=cscA-cotA`?

Answer 1

See below

Explanation:

LHS=left hand side, RHS =right hand side

Use formula `tan (1/2 A) =(1-cosx)/sinx`

LHS`=(1-cosx)/sinx`

`=1/sinx - cosx/sinx`

`=csc x - cot x`

`=RHS`