## Submitting Answers

Numerical answers may be given in standard or scientific notation:
-1.57
3.853e-23
Do not put commas in numbers. Use
23456 not
23,456.

You may refer to the constants and fixed variables in any problem by name:
Pi and pi are always
3.14159265...
3*e0

Operations
Arithmetic operations are * / + -
Implicit multiplication is not recognized. Use 3*a,
not
3a. Use g*(H+h), not
g(H+h).
Powers use ^, as x^2 is *x*^{2}
Order of operation: ^ precedes * or / which in turn precedes + or
-. x^2/3 and
x^(2/3) are different as are 2/3*5 and
2/(3*5).
Use parentheses liberally to avoid ambiguity and errors.

Functions
Square root: either sqrt(x) or
x^(1/2) are OK.
*e*^{x} is exp(x)
ln(*x*) is log(x) or
ln(x)
log_{10}(*x*) is log10(x)

Trigonometric Functions
Note that angles are always given in radians!
sin(*x*) is sin(x), etc.
PHP, the language we use for the website, does not recognize csc(x), sec(x) or cot (x). Use 1/sin(x), 1/cos(x), and 1/tan(x) for these.
sin^{-1}(*x*) is
asin(x), etc.
tan^{-1}(*y/x*) can also be written
as atan2(y,x), etc. This form is superior when there
can be a question of quadrants.

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