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Math·Geometry and Trigonometry·Right triangles and trigonometry

hard

In the xy-plane, an angle with measure $\theta$ radians is in standard position, where $0\le \theta \le \pi /2$. If $\cos (\pi /2-\theta )=5/13$, what is the value of $\tan \theta$?

A

5/12

B

12/13

C

12/5

D

13/5