Step 1:

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The trigonometric functions are $\"\"$ and $\"\"$ .

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Find $\"\"$ , where $\"\"$ .

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$\"\"$ ( Since $\"\"$ )

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Use double - angle formula : $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$

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Solution :

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$\"\"$ .