1.

Let f:R→R be defined as f(x+y)+f(x−y)=2f(x)f(y), f(12)=−1. Then the value of 20∑k=11sin(k)sin(k+f(k)) is equal to

Answer»

Let f:RR be defined as f(x+y)+f(xy)=2f(x)f(y), f(12)=1. Then the value of 20k=11sin(k)sin(k+f(k)) is equal to



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