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Math·Geometry and Trigonometry·Right triangles and trigonometry

hard

In triangle XYZ, angle Y is a right angle, the measure of angle Z is $39^{\circ }$, and the length of YZ is $22$ units. If the area, in square units, of triangle XYZ can be represented by the expression $k\tan (39^{\circ })$, where $k$ is a constant, what is the value of $k$?

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