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Math·Geometry and Trigonometry·Right triangles and trigonometry

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In triangle $QRS$ shown, angle $R$ is a right angle and the length of side $RS$ is 49. Segment $QR$ is shorter than segment $RS$. Which expression represents the length of segment $QS$?

A

$49\cos Q$

B

$49\sin Q$

C

$\frac{49}{\cos Q}$

D

$\frac{49}{\sin Q}$