Jignesh Patel
Assignment 0
MATH262, Fall 2010
due 12/20/2010 at 05:00pm EST.
1.
(1 pt) This problem demonstrates how you enter numerical
answers into WeBWorK.
Evaluate the expression 3
(

1
)(
4

11

2
(
5
))
:
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 (1) * (4):
The asterisk is what most computers use to denote multipli
cation and you can use this with WeBWorK. But WeBWorK will
also allow use to use a space to denote multiplication. You can
either

1
*
4 or 4 or even

1 4. 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, 1
/
√
2 ). 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). (Note: exponents can be indicated by ei
ther a ”caret” or **). Try it.
sin
(
π
/
4
) =
Here’s the
list of the functions
which WeBWorK under
stands. WeBWorK ALWAYS uses radian mode for trig func
tions.
You can also use jutaposition to denote multiplication. E.g.
enter 2sin
(
3
π
/
2
)
. 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.
E.g. 1/2+3 is 3.5, but 1/(2+3) is .2 Why? Try entering both and
use the “Preview” button below to see the difference. In addi
tion 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. The way we use WeBWorK in this
class there is no penalty for getting an answer wrong.
What
counts is that you get the answer right eventually (before the
due date). For complicated answers, you should use the “Pre
view” button to check for syntax errors and also to check that
the answer you enter is really what you think it is.
2.
(1 pt) This problem demonstrates how you enter function
answers into WeBWorK.
First enter the function sin
x
. When entering the function,
you should enter sin(x), but WeBWorK will also except sin x
or even sinx. If you remember your trig identities, sin(x) = 
cos(x+pi/2) and WeBWorK will accept this or any other func
tion equal to sin(x), e.g. sin(x) +sin(x)**2+cos(x)**21
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 Spring '08
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 Trigonometry

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