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Wat Shud be the solution
Pls find the attachment
Pls reply fast
Tysm fr all the help

Nidhi Bhat , 8 Years ago
Grade 11
anser 2 Answers
Vikas TU

Last Activity: 8 Years ago

let k = cos@ + cos(@ + pi) + cos(@ + 2pi) + cos(@ + 3pi) + ….............+ cos(@ + 20pi)
       = cos@ - cos(@) + cos(@) - cos(@) + ….............+ cos(@ + 20pi)
       = 0 + 0 + 0 +........ + cos@
       = cos@
should be the answer.

swapnil

Last Activity: 8 Years ago

cos(A+Npi)+ cos(A+2Npi)=0 (where N belongs to integer) since upon solving series we get cosA as answer
 

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