If z1, z2 and z3, z4 are two pairs of conjugate complex numbers, prove that argz1z4+argz2z3=0.

If z1, z2 and z3, z4 are two pairs of conjugate complex numbers, prove

1.	If z1, z2 and z3, z4 are two pairs of conjugate complex numbers, prove that argz1z4+argz2z3=0.
Answer» If z₁, z₂ and z₃, z₄ are two pairs of conjugate complex numbers, prove that $\arg (\frac{z_{1}}{z_{4}}) + \arg (\frac{z_{2}}{z_{3}}) = 0$ .