You can compute that once you know specific values for variables x, and n. exp n is the exponential function, or antilog to base e. On scientific calculators, you would usually press keys like "inverse" "ln", or "shift" "ln", or something similar. To check whether you did the calculation correctly, exp 1 should show you approximately 2.718.
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tanh is the hyperbolic tangent and it is computed as sinh(x)/cosh(x) = [exp(x)-exp(-x)]/[exp(x)+exp(-x)] and there are other ways of computing it, including infinite series.
(3x-1) * exp(3*x) / 9
If x squared equals n, then x is the square root of n.
For n not equal to -1, it is 1/(n+1)*xn+1 while for n = -1, it is ln(|x|), the logarithm to base e.
Computed is the past tense of compute.