Hard equation

1. The problem statement, all variables and given/known data

please help me solve the following, I do not have a good enough calculator 🙁

15=35 sinΘ([itex]-35 sin\vartheta \pm( \sqrt{(35sin \vartheta)^2 -294)}/-9.8[/itex]) -4.9(([itex]-35 sin\vartheta \pm( \sqrt{(35sin \vartheta)^2 -294)}/-9.8[/itex])^2

It is a massive equation, I tired using wolfram alpha but it took too much computational power…

PS. The parentheses should cover all of the square root, so that it was divided by -9.8


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