$\"\"$

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The limit expression is $\"\"$ .

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Substitute $\"\"$ in the limit expression.

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If $\"\"$ , as $\"\"$ then $\"\"$ .

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$\"\"$

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$\"\"$

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Limit of a trigonometric function : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .