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CBSE Class 11-science Answered

The question is attached
Asked by sudhanshubhushanroy | 08 Dec, 2017, 06:30: AM
answered-by-expert Expert Answer
begin mathsize 16px style Consider comma
straight x equals begin inline style sum from straight n equals 0 to infinity of end style space cos to the power of 2 straight n end exponent straight theta
straight x equals 1 plus cosθ plus cos squared straight theta plus......
It space is space straight a space geometric space progression space with space straight r equals cosθ
Using space formula space for space the space sum space find space straight x.
Similarly space fin space straight y space and space straight z.
Simplify space xyz space term space to space get space the space answer. end style
Answered by Sneha shidid | 15 Dec, 2017, 01:56: PM

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