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Which of the following statements are al...

Which of the following statements are always correct (where Q denotes the set of rationals)? (a)`cos2theta in Q` and `sin2theta in Q rArr tantheta in Q` (if defined), (b)`tantheta in Q rArr sin2theta,cos2theta` and `tan2theta in Q` (if defined) (c) if `sintheta in Q` and `costheta in Q rArr tan3theta in Q` (if defined) (d)if ` sintheta in Q rArr cos3theta in Q`

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