Question

convert the following complex number into its polar representation -4
a.4(cospi + isinpi)
b.-4(cospi/2 + isinpi/2)
c.4(cos3pi/2 + isin3pi/2)
d.-4(cos0 + isin0)

Answer 1

do you know what cos(pi) and sin(pi) equal?
do you know what cos(pi/2) and sin(pi/2) equal?
do you know what cos(3pi/2) and sin(3pi/2) equal?
do you know what cos(0) and sin(0) equal?

also what is r and theta allowed to be in your polar form?
is r allowed only to be positive while theta is between 0 and 2pi?