question no 8 prove
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Here is your Answer....
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To prove:-
CosA/1 - SinA - 1 - SinA/CosA = 2TanA
LHS :-
=} (CosA/1- SinA) - (1- SinA/CosA)
=} { (CosA)² - (1-SinA)² } / (CosA)(1 - SinA)
=} { Cos²A - ( 1 + Sin²A - 2 SinA ) } / (CosA)(1 - SinA) [ ( a-b)² = a² - 2ab + b² ]
=} { Cos²A - 1 - Sin²A + 2 SinA } / (CosA)(1 - SinA)
=} { -Sin²A - Sin²A + 2 SinA } / (CosA)(1 - SinA) [ Cos²A -1 = -Sin²A ]
=} { -2Sin²A + 2 SinA } / (CosA)(1- SinA)
=} (2SinA)(1 - SinA) / (CosA)(1 - SinA)
=} 2SinA/CosA
=} 2 x SinA/CosA [ SinA/CosA = TanA ]
=} 2 x TanA
=} 2TanA
Hence proved...
Hope it helped you...
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