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Home / Doubts and Solutions/JEE/Mathematics

please solve the question

Asked by jaychandran1967 7th December 2017, 5:36 PM
Answered by Expert
Answer:
begin mathsize 16px style cos 20 degree plus 2 sin squared 55 degree minus square root of 2 sin 65 degree cos 20 degree plus 1 minus cos open parentheses 2 cross times 55 degree close parentheses minus square root of 2 sin 65 degree space space space space space space space space space space space space space space Using space 1 minus cos 2 straight theta equals 2 sin squared straight theta cos 20 degree plus 1 minus cos 110 degree minus square root of 2 sin 65 degree space cos 20 degree plus 1 minus cos open parentheses 90 degree plus 20 degree close parentheses minus square root of 2 sin 65 degree space cos 20 degree plus 1 plus sin 20 degree minus square root of 2 sin 65 degree space To space find space sin 65 degree equals sin left parenthesis 45 degree plus 20 degree right parenthesis equals sin 45 degree cos 20 degree plus cos 45 degree sin 20 degree Putting space the space values space and space simplifying space you space will space get space answer space as space 1. end style
Answered by Expert 8th December 2017, 9:18 AM
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