Did You Know...
It is possible make HP48 find a root closest to a number.
Many trancendent equations like y=sin(x) for example
has infinite roots. Using solve it will find a root, in many cases not the one you need.
Give it a number in the field of the vars xand it finds the root closest to this number.
For example 'sin(x)=5' given x in radians
Now put 6 in the field x. It says: 7.853981165738
This is the other root of this equation.
Give it a number and it finds the root closest to this number.