Let sum(k=1)^89cos^6(k^(@))=A then (A)...

Let `sum_(k=1)^89cos^6(k^(@))=A` then (A) `A gt int_0^(pi/2) cos^6theta` `d theta` (B) `A in [20,30]` (C) `A lt (180/pi)``int_0^(pi/2) cos^6theta` `d theta` (D) `A lt int_0^(pi/2) cos^6theta` `d theta`

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