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Given that $\theta = \cos^{-1}\left(\cfrac{7}{9}\right)$, determine which are true.

Mark all that apply.

A

$\sin\theta=\cfrac{4\sqrt2}{9}$

B

$\tan\theta=\cfrac{7\sqrt2}{8}$

C

$\csc\theta=\cfrac{9\sqrt2}{8}$

D

$\sec\theta=-\cfrac{9}{7}$

E

$\cot\theta=\cfrac{7\sqrt2}{16}$

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