This problem demonstrates how you enter numerical answers into WeBWorK.
Evaluate the expression :
In the case above you need to enter a number, since we're testing
whether you can multiply out these numbers. (You can use a calculator
if you want.)
For most problems, you will be able to get WeBWorK
to do some of the work for you. For example
Calculate (-8) * (7):
The asterisk * is what most computers use to denote multiplication and
you can use this with WeBWorK. But WeBWorK will also allow you to use
a space to denote multiplication. You can either or
-56 or even . All will work. Try them.
Now try calculating the sine of 45 degrees ( that's sine of pi over 4
in radians and numerically sin(pi/4) equals 0.707106781186547 or, more
precisely, ). You can enter this as sin(pi/4), as
sin(3.1415926/4), as 1/sqrt(2), as 2**(-.5), etc. This is because
WeBWorK knows about functions like sin and sqrt (square root).
Exponents can be indicated either by a caret ^ or by two
asterisks **. Try it.
Here's the list
of the functions which WeBWorK understands. WeBWorK ALWAYS uses
radian mode for trig functions.
You can also use juxtaposition to denote multiplication. For example,
enter . You can enter this as 2*sin(3*pi/2) or
more simply as 2sin(3pi/2). Try it:
Sometimes you need to use ( )'s to make your meaning clear. For
example, 1/2+3 is 3.5, but 1/(2+3) is 0.2 Why? Try entering both and
use the "Preview" button below to see the difference. In
addition to ( )'s, you can also use [ ]'s and { }'s.
You can always try to enter answers and let WeBWorK do the
calculating. WeBWorK will tell you if the problem requires a strict
numerical answer. There is no penalty for getting an answer wrong,
and you may attempt a problem as many times as you want before the due
date. For complicated answers, you should use the "Preview"
button to check for syntax errors and also to check that the answer
you enter is really what you think it is.
You can earn partial credit on this problem.