## Equations using Complex Number

The topic called Equations using Complex number requires some skills like general solutions for trigonometric equations, De Moivre’s theorem for expanding binomial terms, and finding the angles to make the equations true.

The outcome of the binomial expansion and the expansion by De Moivre’ theorem must be equivalent. So the real and the imaginary parts must be equated for finding the expression of sin and cos in terms of the angle.

When comparing the values of trigonometric ratios, sketching the graph is highly recommended.

Try these questions!

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