Question: Simplification of trigonometric equation with square

Hello,

I would like to silmplify a trigonometric equation with some squares. I'm sure this equation can be reduced but i didn't manage to simplify it with Maple.

Here is the equation (named condition in the maple file) that I would like to simplify:

simplification_condition_de_compatibilité.mw

May you help me to simplify this trigonometric equation?

I would like simplification if time the pattern cos()^2+sin()^2 appears.

Thanks a lot for your help

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