Step 1 :

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The trigonometric expression is \"\".

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Consider \"\".

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Rewrite the expression as

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\"\".

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\"\"

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\"\"

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Use the trigonometric identity : \"\".

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\"\"

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Simplify the expression.

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\"\"

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\"\"

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 \
 Cancel common terms.
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\"\"

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Use the trigonometric identity : \"\" 

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\"\"

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\"\"

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Solution :

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\"\"

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