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`        Q:-  ∫(cos -3/7x)(sin-11/7x) dx`
7 years ago

147 Points
```										Dear Tapasranjan
∫(cos -3/7x)(sin-11/7x) dx
∫(cos -14/7x)(cos 11/7x)(sin-11/7x) dx
∫(cos -14/7x)(cos 11/7x)(sin-11/7x)  dx
∫(cos -2x)(cos 11/7x)/(sin11/7x)   dx
∫sec 2x/tan11/7x      dx
let  tanx =t
sec2x dx =dt
∫1/t11/7      dt
= -(7/4)  t-4/7x  +c
=-7/4tan4/7x  +c
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 ExpertsBadiuddin

```
7 years ago
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