Euler's formula states that, for any real number x,
eix = cos x + i sin x
where e is the base of the natural logarithm, i is the imaginary unit, and cos and sin are the trigonometric functions cosine and sine respectively, with the argument x given in radians.
[Sources:]
[1] My own knowledge.
[2] linked
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no
the formula is FOR not fo
no, there is not a general formula for all angles
The area formula for the parallelogram is related to the area formula for a rectangle because you can make the parallelogram into a rectangle to find the area.
I am not sure what you are asking. A hexagon doesn't actually have a formula. Do you mean a formula for the interior angles? or what? Please can you clarify your question.