trying to graph, however graph is blank when i enter it. Please help!
Plot[ArcCos[1/2 (3094 + 2 x^3 Cos[25] + x (686 Cos[25] - 422 Sin[25]) +
x^2 (27 + 15 Cos[50] - 35 Sin[50]))], {x, 0, 20}]
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Try the following (as proposed by @xzczd),
equ = ArcCos[1/2 (3094 + 2 x^3 Cos[25] + x (686 Cos[25] - 422 Sin[25]) +
x^2 (27 + 15 Cos[50] - 35 Sin[50]))]
Plot[{Re@equ, Im@equ}, {x, -20, 20}, PlotLegends -> "Expressions"]
And check the following ressources:
How to | Create Plots, the Tutorials are quite informative
Plot[Im[(*your expression*), {x, 0, 20}]– xzczd Sep 18 '15 at 06:40