Write a function to convert polar coordinates to rectangular coordinates.
import cmath
def polar_rect(x,y):
 cn = complex(x,y)
 cn=cmath.polar(cn)
 cn1 = cmath.rect(2, cmath.pi)
 return (cn,cn1)
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to convert polar coordinates to rectangular coordinates.
import cmath
def polar_rect(x,y):
 cn = complex(x,y)
 cn=cmath.polar(cn)
 cn1 = cmath.rect(2, cmath.pi)
 return (cn,cn1)[/INST]assert polar_rect(3,4)==((5.0, 0.9272952180016122), (-2+2.4492935982947064e-16j))
assert polar_rect(4,7)==((8.06225774829855, 1.0516502125483738), (-2+2.4492935982947064e-16j))
assert polar_rect(15,17)==((22.67156809750927, 0.8478169733934057), (-2+2.4492935982947064e-16j))</s>