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dabs, dexp, dlog, dsqrt

dabs(num)
:: 絶対値 |num| を求める.
dexp(num)
:: 函数値 exp(num) を求める.
dlog(num)
:: 対数値 log(num) を求める.
dsqrt(num)
:: 平行根 sqrt(num) を求める.
return
倍精度浮動小数
num
[0] dexp(1);
2.71828


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