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Math·Geometry and Trigonometry·Right triangles and trigonometry

hard

In triangle $JKL$, the measure of angle $J$ is $(90b{)}^{\circ }$, the measure of angle $K$ is $(69a{)}^{\circ }$, and the measure of angle $L$ is $(21a{)}^{\circ }$, where $a$ and $b$ are constants. Which of the following must be true?

A

$\cos L>\sin K$

B

$\cos L=\sin K$

C

$\cos L<\sin K$

D

There is not enough information to compare the values of $\cos L$ and $\sin K$