This problem will help you learn the rules of precedence, i.e. the order in which mathematical operations are preformed. So first let us review the normal way operations are performed.

The operations are listed here from what is done first to last:

First: Paranthesis
Second: Functions
Third: Powers and Roots
Fourth: Multiplicaton and Division
Last: Addition and Subtraction

For example what is 1+2*3^2?

How do you enter $$\frac {1+\sin(3)}{2+\tan(4)}?$$ Hint: this is a good place to use paranthesis, [ ]'s, and the Preview Answer button.

There is one other thing to be careful of. Multiplication and division have the same precedence and there are no universal rules as to which should be done first. WeBWorK and most other computers read things from left to right, i.e. 2/3*4 means (2/3)*4. If you want 2/(3*4) = 2/12, you have to use parentheses. This is also a case where previewing your answer can save you a lot a grief since you will be able to see what you entered.
Enter 2/3*4 and use the Preview Answer button to see what you get.