Plot 2.0

syntax examples: 1/10, 0.1, x, -x, (x), x-y, x+y, x*y, x/y, x^y, abs(x), acos(x), asin(x), asinh(x), atan(x), ceil(x), cos(x), cosh(x), exp(x), floor(x), log(x), round(x), sin(x), sinh(x), sqrt(x), tan(x), tanh(x)
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