Math, asked by BishalChaurasiya, 1 year ago

question no 8 prove​

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Answered by Anonymous
0

Here is your Answer....

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Answered by RahulRJVeer
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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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