given that p=q=r. if pq=r then the angle between p and r is theta1 if pq=0 then the angle b/w p and r is theta2 . what is the relation b/w theta1 and theta2 1)theta1=2 2) theta1 =theta2/2 3) theta1 =2theta2 4)none

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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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