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Math·Geometry and Trigonometry·Right triangles and trigonometry

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In the figure above, $MNPQ$ is a rectangle. Which of the following must be true?

A

$\cos (\angle MNQ)=\sin (\angle QPN)$

B

$\cos (\angle MNQ)=\sin (\angle QNP)$

C

$\cos (\angle NMQ)=\sin (\angle PQN)$

D

$\cos (\angle NQM)=\sin (\angle QPN)$