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dabs, dexp, dlog, dsqrt

dabs(num)
:: Get the absolute value of num.
dexp(num)
:: Get the value of expornent of num.
dlog(num)
:: Get the value of logarithm of num.
dsqrt(num)
:: Get the value of square root of num.
return
floating point number
num
number
[0] dexp(1);
2.71828


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