SAT Math Practice Question #28180 - SATify | SATify

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SAT Math Practice Question #28180 - SATify | SATify

#28180

sequences and series

algebra

functions

hard

150 sec

Let $f (x) = cos (π x)$ . What is the value of the sum
$\sum_{k = 1}^{2020} f (\frac{k}{2021})$

A.

$0$

B.

$cos (\frac{π}{2021})$

C.

$2020 cos (\frac{π}{2021})$

D.

$1$

E.

$- 1$