  # Cis in math

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## cis (mathematics)

Learn Math with the best. 1st class free! > X. Topics. Modulus of a complex number; Argument of a complex number; Expression of a number

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## cis (mathematics)

Dept. of Math. (MAT021) If one defines cis θ = cos θ + i sin θ, then any complex number may be expressed in the form z = |z| cis θ.

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Figure out math equations

Math is a subject that can be difficult for some students to grasp. However, with a little practice and perseverance, anyone can learn to love math!

Figure out math equation

Math is a challenging subject for many students, but with practice and persistence, anyone can learn to figure out complex equations.

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## Complex numbers in polar and trigonometric form

cis(θ) is short for cos(θ)+isen(θ) where i = √-1. Then: 12cis(90°) = 12[cos(90°)+isen(90°)] = 12(0+i(1))