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Math·Geometry and Trigonometry·Right triangles and trigonometry

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If $\sin x^{\circ }=k$, which of the following must be true for all values of $x$?

A

$\sin \left(\frac{\pi }{2}-x^{\circ }\right)=k$

B

$\cos (90^{\circ }-x^{\circ })=k$

C

$\sin (x^2{)}^{\circ }=k$

D

$\cos (x^{\circ })=k^2$