# 9เลือกประเภทWhat is the polar form of the complex number 1 + i?√2 (cos π/4 + i sin π/4)2 (cos π/4 + i sin π/4)√2 (cos π/2 + i sin π/2)2 (cos π/2 + i sin π/2)
# 12เลือกประเภทWhat is the principal square root of -i?1/√2 - i/√2-1/√2 + i/√21/√2 + i/√2-1/√2 - i/√2
# 13เลือกประเภทWhat does the modulus of a complex number represent geometrically?The slope of the lineThe distance from the originThe angle with the x-axisThe area of the triangle formed
# 15เลือกประเภทWhat is the effect of rotating a complex number by 90 degrees counterclockwise?Multiply by iDivide by iAdd iSubtract i