Question

How do you multiply `1.41(\cos 315^\circ + i \sin 315^\circ)`?

Answer 1

I assume that `1.41` is a decimal approximation of `sqrt{2}` here.

`sqrt{2}(cos315^circ+i sin315^circ)=sqrt{2}(1/sqrt{2}-1/sqrt{2}i)=1-i`

---

I hope that this was helpful.