Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. π/8 sin П Cos T tan 8 800 = = 11 √2-1 2√2 √2 +1 2√2 √2-1 √2 +1

Find all complex square roots of -2+2/3i. In other words, find all complex solutions of x=- B i. חinזה חה Fvnl Check

Find the rectangular forms of all 6th roots of z = -64i.

23. Explain why the equation x³ + x +1 = 0 has no real roots and why each of its complex roots is constructible.