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Math·Geometry and Trigonometry·Right triangles and trigonometry

hard

In the figure, $2r>13s$. Which of the following values must be the greatest?

A

$\sin r^{\circ }$

B

$\cos s^{\circ }$

C

$\frac{\sin r^{\circ }}{\sin s^{\circ }}$

D

$\frac{\sin r^{\circ }}{\cos s^{\circ }}$