Problem 3. Let z₁ = 1+ √√3i and z₂ = -1- i. 1. Express 21 and 22 using exponential notation, i.e., z = re⁹i; 2. Compute 21 22❘ and arg(21 · 22); 3. Compute and arg(). = rei Problem 4. Express the following complex numbers using exponential notation, i.e., z = 1. cosa i sin a; 2. sin a + i cosa; 3. sin a-i cosa. (Hint: first use trigonometric identities to write each one in the form of cos 0 + i sin 0.) Problem 5. Consider the following polynomial equation x² = 2x 1. Find all real valued solutions of this equation; 2. Find all (real and complex) solutions of this equations.