Arithmetic Operations on Functions

Sum	(f + g)(x) = f(x) + g(x)
Difference	(f - g)(x) = f(x) - g(x)
Product	(f × g)(x) = f(x) × g(x)
Quotient	(f/g)(x) = f(x)/g(x), if g(x) is not equal to 0.

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