$\"\"$

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The trigonometric function is $\"\"$ .

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Apply reciprocal identity : $\"\"$ .

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Pythagorean identity : $\"\"$ .

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$\"\"$

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The trigonometric function is $\"\"$ .

\

Apply reciprocal identity : $\"\"$ .

\

$\"\"$

\

\

The trigonometric function is $\"\"$ .

\

Pythagorean identity : $\"\"$ .

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$\"\"$

\

The trigonometric function is $\"\"$ .

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Apply reciprocal identity : $\"\"$ .

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$\"\"$

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$\"\"$

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