Question

What is the product of z1 and z2 if
z1 = 7[cos(-70°) + i sin(-70°)] and z2 = 44(cos115° + i sin115°)?

Answer 1

Answer:

308[cos(45) + isin(45)]

Step-by-step explanation:

z1×z2:

Modulus: r1 × r2

= 7×44 = 308

Argument: theta1 + theta2

= -70 + 115 = 45

z1z2 = 308[cos(45) + isin(45)]

Or

z1z2 = 154sqrt(2) + (i)154sqrt(2)

sqrt: square root

Answer 2

Answer: a

Step-by-step explanation: edge 2021