It returns `cbrt(x)`

. It gets more accurate as `iter`

gets bigger.

It returns `cos(x)`

. It gets more accurate as `iter`

gets bigger.

pre-calculated value of e. It’s equal to `e_iter(15)`

.

It returns an approximate value of E.
It gets more and more accurate as `k`

gets bigger.

It returns `e^x`

. It gets more accurate as `iter`

gets bigger.

pre-calculated value of ln2. It’s equal to `ln2_iter(11)`

.

It returns an approximate value of ln(2).
It gets more and more accurate as `k`

gets bigger.
For now, `k`

should be less than 200.

It returns `ln(x)`

. It gets more accurate as `iter`

gets bigger. It panics when `x`

is less than 0.

It returns log(x) with base `base`

. It gets more accurate as `iter`

gets bigger. It panics when `x`

or `base`

is less than or equal 0.

pre-calculated value of pi. It’s equal to `pi_iter(7)`

.

It returns an approximate value of PI.
It gets more and more accurate as `k`

gets bigger.
For now, `k`

should be less than 255.

It returns `a^b`

. It gets more accurate as `iter`

gets bigger. If `b`

is an integer, try `Ratio::pow_i32`

instead. It panics when `a`

is less than 0. `0^0`

is 0.

It returns `sin(x)`

. It gets more accurate as `iter`

gets bigger.

It returns `sqrt(abs(x))`

. It gets more accurate as `iter`

gets bigger.

It returns `tan(x)`

. It gets more accurate as `iter`

gets bigger.