2cos^2 (x) + sin^2 (x) = 2
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2cos² (x) + sin² (x) = 2
cos²x + (cos²x + sin²x) = 2
cos²x + 1 = 2
cos²x = 1
cos x = 1 or -1
x = 0° if cosx = 1
x = 180° if cosx = -1
cos²x + (cos²x + sin²x) = 2
cos²x + 1 = 2
cos²x = 1
cos x = 1 or -1
x = 0° if cosx = 1
x = 180° if cosx = -1
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