I have reduced a problem I am trying to solve to something simpler though rather difficult: Four side lengths and an angle uniquely describe a quadrilateral, solve one of the angles adjacent to the one given. No matter what algebraic / trigonometric manipulations I apply I cannot get a simplified relation between the angle and the five given variables.(adsbygoogle = window.adsbygoogle || []).push({});

I would appreciate a pointer or two, thankyou.

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# Trigonometry problem

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