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Home / Doubts and Solutions/JEE/Mathematics

Prove that

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Asked by Anish 9th July 2018, 1:08 PM
Answered by Expert
Answer:
begin mathsize 16px style tan squared straight A equals fraction numerator 1 minus cos 2 straight A over denominator 1 plus cos 2 straight A end fraction open parentheses 1 over 7 close parentheses squared equals fraction numerator 1 minus cos 2 straight A over denominator 1 plus cos 2 straight A end fraction fraction numerator 1 minus cos 2 straight A over denominator 1 plus cos 2 straight A end fraction equals 1 over 49 49 minus 49 cos 2 straight A equals 1 plus cos 2 straight A 50 cos 2 straight A equals 48 cos 2 straight A equals 48 over 50 equals 24 over 25 sin 4 straight B equals 2 sin 2 Bcos 2 straight B equals 2 open parentheses fraction numerator 2 tanB over denominator 1 plus tan squared straight B end fraction close parentheses open parentheses fraction numerator 1 minus tan squared straight B over denominator 1 plus tan squared straight B end fraction close parentheses equals cos 2 straight A end style
 
NOTE : Please check your question.
Answered by Expert 10th July 2018, 11:47 AM
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