Hello,
[MATH]solve(tan({a*π}/180)-{a*π}/180≡0,01571448;a;15;25)=20,3439[/MATH]
Take a look at the SMath Wiki and find out how to use function "solve".
Regards,
Radovan
P.S. In what way is SMath connected to your exam?
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"