A body is under SHM when their displacement from the mean position are 4 cm and 5 cm It has velocity 10 centimetre per second and 8 cm per second its period is i

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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