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# De Moivre's Theorem : Write a cis expression in standard complex form (a+bi)

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Use Demoivre's theorem to write [3 cis(pi/2)]squared in the form a+bi without trigonometric functions.

Find the real and complex solution of the equation Xsquared - 8 = 0

Find the angle between the two vectors (5,2) and (-2,5)

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#### Solution Preview

Use Demoivre's theorem to write [3cis(pie/2)]squared in the form a+bi without trigonometric functions.

The question is unclear. I assume your question is

Use Demoivre's theorem to write [3cos(pie/2)]squared in the form a+bi without ...

#### Solution Summary

A cis expression is written in standard complex form (a+bi). The angle between two vectors with points are determined.

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