It could. This is what would happen if it did.
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Sine and the cosine of the angle.
It is a FALSE statement.
If sine theta is 0.28, then theta is 16.26 degrees. Cosine 2 theta, then, is 0.8432
No, it does not.
Sine(A+ B) = Sine(A)*Cosine(B) + Cosine(A)*Sine(B).