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Home / Doubts and Solutions/JEE/Mathematics

Q20

Asked by Tanishq 25th October 2017, 5:23 PM
Answered by Expert
Answer:
begin mathsize 16px style 3 tanA minus 4 equals 0 tanA equals 4 over 3 Find space secA comma space cosA comma space sinA space using sec squared straight A equals 1 plus tan squared straight A comma space cosA equals 1 over secA comma space sin squared straight A equals 1 minus cos squared straight A As space per space the space given space condition space angle space is space in space third space quadrant space secA comma space sinA comma space cosA will space be space negative. space You space will space get secA space equals space fraction numerator negative 5 over denominator 3 end fraction comma space cosA space equals space fraction numerator negative 3 over denominator 5 end fraction comma space sinA space equals fraction numerator negative 4 over denominator 5 end fraction LHS space equals space 5 sin 2 straight A space plus space 3 sinA space plus space 4 cosA equals 5 space cross times space 2 sinAcosA space plus space 3 sinA space plus space 4 cosA After space substituting space values space and space solving space you space will space get equals 0 space end style
Answered by Expert 14th December 2017, 4:48 PM
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