# Symbolic math problem

I need find in sage numberic value of expression like

```
s=cos(99.9500000000000*pi + 199.900000000000*pi*real_part(sgn(sin(49.9750000000000*pi))))*e^(-199.900000000000*pi*imag_part(sgn(sin(49.9750000000000*pi)))) + 1
```

but s.n() gives error "TypeError: cannot evaluate symbolic expression numerically". How to resolve this problem?