$\"\"$

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Trigonometric expression is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ and $\"\"$ indicates that $\"\"$ and $\"\"$ have positive values, this is possible when the angle lie in Quadrant I. $\"\"$ and $\"\"$ are positive.

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$\"\"$

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Here $\"\"$ and $\"\"$ .

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Find $\"\"$ .

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Pythagorean Theorem : $\"\"$ .

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$\"\"$

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Since $\"\"$ is positive $\"\"$ .

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$\"\"$

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Find the five trigonometric ratios using $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ . $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .