Rational fools

Geometry Level 3

A=sin15B=cos15C=sin15cos15D=sin15cos75A = \sin 15^\circ \\ B=\cos 15^\circ \\ C= \sin 15^\circ\cos 15^\circ \\ D = \sin 15^\circ\cos 75^\circ

Which of the following is/are rational?

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