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cos nA= cosnA(1-nC2 tan2A-nC4 tan3A -…)
Dear Sonam we know cosnA + iSin nA =(cosA +isinA)n open bracket with the help of binomial cosnA + iSin nA =(cosA +isinA)n = cosnA + nC1 cosn-1A(isinA) + nC2cosn-2A(isinA)2 +....... = (cosnA - nC2cosn-2A(sinA)2 +.... ) + i(nC1 cosn-1A(sinA) - nC3 cosn-3A(sinA)3 .......) compair Real part Cos nA = (cosnA - nC2cosn-2A(sinA)2 +.... ) =cosnA(1-nC2 tan2A-nC4 tan3A -…) Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best. Regards, Askiitians Experts Badiuddin
Dear Sonam
we know
cosnA + iSin nA =(cosA +isinA)n
open bracket with the help of binomial
cosnA + iSin nA =(cosA +isinA)n = cosnA + nC1 cosn-1A(isinA) + nC2cosn-2A(isinA)2 +.......
= (cosnA - nC2cosn-2A(sinA)2 +.... ) + i(nC1 cosn-1A(sinA) - nC3 cosn-3A(sinA)3 .......)
compair Real part
Cos nA = (cosnA - nC2cosn-2A(sinA)2 +.... )
=cosnA(1-nC2 tan2A-nC4 tan3A -…)
Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best. Regards, Askiitians Experts Badiuddin
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