The equation is .

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Find the fourth roots of , write in polar form.

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If , then .

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Polar form of is .

Write an expression for fourth roots.

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Let successively to find the fourth roots.

Substitute in .

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Substitute in .

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Substitute in .

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Substitute in .

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The fourth roots of are , , and .

Thus, the solutions to the equation are , , and .

, , and .