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Q)

Which of the following number is/are rational?

$(a)\;\sin 15^{\large\circ}\qquad(b)\;\cos 15^{\large\circ}\qquad(c)\;\sin 15^{\large\circ}\cos 15^{\large\circ}\qquad(d)\;\sin 15^{\large\circ}\cos 75^{\large\circ}$

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