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Use a triangle to find the exact value of $\csc\left[\cos^{-1}\left(-\cfrac{3}{4}\right)\right]$

A

$\dfrac{5}{4}$

B

$-\dfrac{4}{3}$

C

$-\dfrac{5}{4}$

D

$\dfrac{4\sqrt7}{7}$

E

$-\dfrac{\sqrt3}{7}$

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