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Which of the following number (s) is/...

Which of the following number (s) is/are rational ? a.`sin 15^0` b. `cos 15^0\ ` c.`sin 15^0cos 15^0\ ` d. `sin 15^0\ cos 75^0`

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Which of the following number(s) is/are rational? (a)sin 15^(0)(b)cos15^(0)(c)sin15^(0)cos15^(0)(d)sin15^(0)cos75^(0)

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