4. (a) Prove the reduction formula: tan?n-1 (2r) _ [ tann-2 (2r) dr 4n- 2 tan" (2.r) dr (b) The reduction formula is a recurrence relation given by 1.= fun tan" (20) da and lo = / tan? (20) da Evaluate Io with integration. (c) Now find Is using recursion from (b). Do not integrate in this step, integration will result in no marks for this part.

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A: Note:- As per your demand we solve question 14 and 15 for you  Given problems:-

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