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The notation $f(t)$ indicates the product of $f$ and $t\text{.}$

If $y=f(x)\text{,}$ then $f(x)$ gives the value of the input variable.

If $Q$ is a function of $M\text{,}$ we may write $M=f(Q)\text{.}$

In the equation $d=g(n)\text{,}$ the letters $d\text{,}$ $g\text{,}$ and $n$ are variables.