Answers

2016-02-16T04:23:32+05:30
Because Of Theta Proper Symbol Not Present I m Denoting Theta As A
m
²- n² = (m+n)(m-n)               [a² + b² = (a+b)(a-b)]
Therefore,
 
Substituting The Value Of "m" And "n"
m² - n²    =(TanA + SinA + TanA - SinA) (TanA + SinA -TanA +SinA)         
               =
(2 TanA)(2 SinA)
               =2 SinA/Cos A * 2 SinA                    [Tan A= Sin A/Cos A]
               =4 Sin²A/Cos A

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