Question

How do you express the complex number in trigonometric form `2(cos 0° + i sin 0°)`?

Answer 1

I am not sure if I got it right. Your number is in trigonometric form so maybe you want to change it into standard form `a+bi`...?
If is so, you know that:
`cos0°=1`
and
`sin0°=0`
so your complex number becomes: `z=2(1+i*0)=2+i0=2` which is a pure Real.