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Let y = cosa1 cosa2 ...cosa(n-1) cosan ...

Let `y = cosa_1 cosa_2 ...cosa_(n-1) cosa_n and a_1 + a_n = a_2+a_(n-1)=..........=90^@,0 leq a_1,a_2,.....a_n leq 90^@` and n is an even number. If the maximum and the minimum values of y areM and m respectively, then `M + m` is

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