Question

How do you use a calculator to evaluate `tan(-(25pi)/7)`?

Answer 1

-0.48

Explanation:

`tan (- 25pi/7) = tan (- tan pi/7 - 24pi) = tan (- pi/7)`
`tan (-pi/7) = tan - 180/7 = tan (-25^@7142)`
Calculator gives -->
`tan (-25.7142) = - 0.4815`