Step 1:

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The trigonometric function is \"\".

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Rewrite the trigonometric function is \"\".
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Simplify the function.
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\"\"
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Fundamental trigonometric identities: \"\".
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\"\"
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Rewrite the trigonometric function is
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\"\"
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Addition formula for trigonometric identity is \"\".

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Substitute \"\" and \"\"in the trigonometric formula.

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\"\"

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Solution:

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The value of trignomoteric expression is \"\"