Question

In: Math

For the following exercises, find z1 z2 in polar form.

For the following exercises, find z1 z2 in polar form.

Solutions

Expert Solution

Consider two complex numbers as follows,

z1 = 3∙cis(π/4) and z2 = 5∙cis(π/6)

 

Use the formula for the multiplication of two complex numbers,

z1z1 = r1r2[cos(θ1 + θ2) + sin(θ1 + θ2)]

 

Substitute r1 = 3, r2 = 5, θ1 = π/4 and θ2 = π/6, the multiplication of above complex numbers will be,

z1z1 = 3 × 5 ×[cos(π/4 + π/6) + sin(π/4 + π/6)]

         = 15 × [cos(5π/12) + sin(5π/12)]

 

Therefore, the multiplication of above complex numbers is z1z2 = 15∙(5π/12).


Therefore, the multiplication of above complex numbers is z1z2 = 15∙(5π/12).

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