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Let f(n)=prod(f=1)^(n) sin(r), where r i...

Let `f(n)=prod_(f=1)^(n) sin(r),` where r is in radians, then

A

`f(4)gt0`

B

`f(6)gt0`

C

`f(1)+f(5)+f(10)gt0`

D

`f(1)+f(5)+f(10)lt0`

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