5. The sum of the series (-1)" T is 320 (2n)! ロ=0 a) cos t C) cos 3 TC b) sin d) %

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A: Part aGiven,         cosα=35

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A: Sin 2a = 2516​Explanation:If you have any questions please let me know in comment box thankyou.

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Q: 41 Prove al tanx + cosx= Sin X (sec x+ Cot x) メ b) Cos 2 ttan' t= Sin? t es Cos? (tan"x+ 1 = 1 %3D

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A: Note: You didn't mention the method from which question is being solved. So, I does the question…