Cis notation

Evaluate multiplication of two complex numbers in cis notation:

(6 cis 120°)(4 cis 30°)

Write result in cis and Re-Im notation.

Result

c = (Correct answer is: 12 cis 150°) Wrong answer
R =  -10.3923
I =  6

Step-by-step explanation:

A=3 4=12 α=120+30=150 °  c=12 cis150°
R=A cosα°=A cos150° =12 cos150° =12 (0.866025)=10.392=10.3923
I=A sinα°=A sin150° =12 sin150° =12 0.5=6=6



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Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

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