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Home / Doubts and Solutions/JEE/Mathematics

Sir pls solve the following.

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Asked by rsudipto 5th January 2019, 9:19 AM
Answered by Expert
Answer:
begin mathsize 16px style straight a squared plus straight b squared plus straight c squared equals 8 straight R squared Using space sin space rule sin squared straight A plus sin squared straight B plus sin squared straight C equals 2 sin squared straight A plus 1 minus cos squared straight B plus 1 minus cos squared straight C equals 2 minus cos squared straight B minus cos squared straight C plus sin squared straight A equals 0 cos squared straight B plus cos squared straight C minus sin squared straight A equals 0 cos squared straight B plus cos open parentheses straight C plus straight A close parentheses cos open parentheses straight C minus straight A close parentheses equals 0 minus cosB left square bracket negative cosB plus cos left parenthesis straight C minus straight A right parenthesis right square bracket equals 0 minus 2 cosBcosCcosA equals 0 hence comma space one space of space the space angle space of space straight a space triangle space should space be space 90 degree. end style
Answered by Expert 7th January 2019, 11:18 AM
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