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Convergence of Trigonometric Sequences

TOPO-PN3$GY

Let $a_n$ be a sequence. Suppose $\sin a_n$ converges. Then which of the following sequence(s) necessarily converge? Select ALL that apply.

A

$\cos a_n$

B

$\tan a_n$

C

$\sec a_n$

D

$\cos^2 a_n$

E

$\tan^2 a_n$

F

$\sec^2 a_n$