In degree mode.
cos(40)
= 0.7660444431 degrees ( 77 degrees will do )
In radians.
cos(40)
= - 0.6669380617 radians
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It is cosine*cosine*cosine.
The cosine of 60 degrees is 0.5
Cosine = Adjacent/hypotenuse
The derivative of negative cosine is positive sine.
-- If the "14" is degrees, then the cosine is 0.970 . -- If the "14" is radians, then the cosine is 0.137 . -- If the "14" is grads, then the cosine is 0.976 .