replaced http://codegolf.stackexchange.com/ with https://codegolf.stackexchange.com/
JavaScript, 39 bytes, SLuck49
x=>(l=Math).cbrt(l.exp(l.log(x)*7.5))
or similarly
x=>(l=Math).exp(l.log(l.cbrt(x))*7.5)
Test:
alert((
x=>(l=Math).cbrt(l.exp(l.log(x)*7.5))
)(prompt()));
JavaScript, 39 bytes, SLuck49
x=>(l=Math).cbrt(l.exp(l.log(x)*7.5))
or similarly
x=>(l=Math).exp(l.log(l.cbrt(x))*7.5)
Test:
alert((
x=>(l=Math).cbrt(l.exp(l.log(x)*7.5))
)(prompt()));