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Math·Geometry and Trigonometry·Right triangles and trigonometry

easy

For the figure shown, which of the following is true?

A

$\sin 21^{\circ }=\cos 69^{\circ }$

B

$\sin 21^{\circ }=\cos 21^{\circ }$

C

$\cos 21^{\circ }=\tan 21^{\circ }$

D

$\tan 21^{\circ }=\cos 69^{\circ }$