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```
cos nA= cosnA(1-nC2 tan2A-nC4 tan3A -…)

```

6 years ago

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```										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

```
6 years ago

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