The answer will depend on whether the angle is measured in degrees or radians.
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I suggest that it is (sin A)^2 + (cos A)^2 = 1
In radians. sin(1.0003) = 0.8416330376 ===================
It is ln[1+sqrt(2)] = 0.8814, approx.
sin^2 (feta) + cos^2 (feta) = 1 sin (feta) / cos (feta) = tan (feta)
angle can be defined as sin-1=O/H, cos-1=/H, or Tan-1=O/A