Step 1:

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Eulers Rule :

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$\"\"$ .

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$\"\"$ .

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$\"\"$ and $\"\"$ .

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Step 2:

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The expression is $\"\"$ .

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$\"\"$

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Apply formula : $\"\"$ and $\"\"$ .

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$\"\"$

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Apply double-angle formula: $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Solution :

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$\"\"$ .