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The numbers from 0 to 100 (at least) can represented by simple mathematical expressions using the number 4 precisely four times.
Bad sums wil be left into enhance embarassment but illegal usage will be edited to prevent it.
Anything in Red is not necessarily wrong - it just means the eval() aint working.
Good
Bad
x^x - although some answers might be red
sqrt(x) - as there is mathematical (but not browser) sign for it
4! - i.e. 4x3x2x1
.4
.4r
square(x) is actually x² which if you need it must be x*x
cubed(x) is actually x³ which if you need it must be x*x*x