Mark (√) against the correct answer in each of the following:
Formula :- 
Therefore ,
⇒
⇒
⇒
(Multiply by 
in numerator and denominator)
⇒
⇒ 
1
Mark (√) against the correct answer in each of the following:
Formula :-
Therefore ,
⇒
⇒
⇒
(Multiply by in numerator and denominator)
⇒
⇒