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The most basic expressions are numbers and variables. Any combination of expressions with +, -, x, /, powers, or other special functions (such as sine, cosine, logarithm, etc.) are also expressions. Thus, each of the following is a valid math expression:

5

x

x + 3

4xy

ax2 + bx + c

sin(x) / log(y)

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Q: How do you make a math expression?
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