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It is 1.
If sine theta is 0.28, then theta is 16.26 degrees. Cosine 2 theta, then, is 0.8432
It also equals 13 12.
Until an "equals" sign shows up somewhere in the expression, there's nothing to prove.
Tangent (theta) is defined as sine (theta) divided by cosine (theta). In a right triangle, it is also defined as opposite (Y) divided by adjacent (X).