What is the cos0?
The value of ##costheta## is equal to ##1##.
Because, It is the x-coordinate of the point on the unit circle after a 0-radian rotation (counterclockwise) from the positive x-axis (right). Since there has been zero rotation, the point on the circle is still also on the x-axis. The unit circle has radius 1, by definition, so cos(0) = 1.
Hope this helps:)
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