If you have a right triangle, the sine of an angle is the ratio of the opposite side to the hypotenuse.
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In radians. sin(1.0003) = 0.8416330376 ===================
The uses of Sin, Cos etc. in Maths is in relation to Trigonometry. Trigonometry is the study of the relationship between angles and lengths of triangles.
I suggest that it is (sin A)^2 + (cos A)^2 = 1
sin^2 (feta) + cos^2 (feta) = 1 sin (feta) / cos (feta) = tan (feta)
The answer will depend on whether the angle is measured in degrees or radians.