How do you convert -3+5i to trigonometric notation, like cis form

x + yi              --->      -3 + 5i            --->      x  =  -3     and     y  =  5

rcis(theta)      --->     r  =  sqrt( x² + y² )     --->     r  =  sqrt( (-3)² + (5)² )     --->     r  =  sqrt( 34)

                      --->    theta  =  tan^-1( y/x )     ===>     theta  =  tan^-1( 5/-3 )     --->     theta  =  120.96^o 

sqrt(34) · cis ( 120.96^o )

z = -3+5i

Algebraic form:
z = -3+5i

Exponential form:
z = 5.8309519 × ei 120°57'50″

Trigonometric form:
z = 5.8309519 × (cos 120°57'50″ + i sin 120°57'50″)

Polar form:
r = |z| = 5.83095
φ = arg z = 120.96376° = 120°57'50″ = 0.67202π