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The value of underset(r=1)overset(18)sum...

The value of `underset(r=1)overset(18)sum cos^(2)(5r)^(@)`, where `x^(@)` denotes the x degree, is equal to

A

0

B

`7/2`

C

`(17)/2`

D

`(25)/2`

Text Solution

Verified by Experts

The correct Answer is:
C
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