Yes, y=x^2 is a non-linear function. In fact it is a parabola. Graphing one is quite easy using a table of values or other methods.
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X = √63
2 x cosine squared x -1 which also equals cos (2x)
So u have the function x2-4=0 Now because 4 is a squared number, its square root is 2 (x+2)(x-2)=0
(2, -2)
If x squared = 40 then x = square root of 40 = +/- 6.3255555