\"\"

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The trigonometric identity is \"fraction.

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Start with the left side,

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\"equal

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\"equal                        (Apply pythagorean identity: \"begin)

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\"equal                (Apply standard division formula: \"fraction)

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\"equal           (Apply reciprocal identity: \"italic)

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\"equal        (Apply quotient identity: \"fraction)

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\"equal                     (Simplify)

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Then left side identity and right side identity is equal.\"\"

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The trigonometric identity is established.