$\"\"$

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Find $\"\"$ .

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The values of $\"\"$ and $\"\"$ .

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Find the value of $\"\"$ by using pythagorean identity.

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Pythagorean identity : $\"\"$ .

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$\"\"$

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Since $\"\"$ is in first quadrant, take the value of $\"\"$ .

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$\"\"$

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Find the value of $\"\"$ by using pythagorean identity.

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Pythagorean identity : $\"\"$ .

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$\"\"$

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Since $\"\"$ is in first quadrant, take the value of $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute the values $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .