$\"\"$

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The equation is $\"\"$ .

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Let $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Opposite side is $\"\"$ .

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Hypotenuse is $\"\"$ .

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Pythagorean theorem : $\"\"$ .

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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$\"\"$ .

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$\"\"$

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Substitute $\"\"$ in equation (1).

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Therefore, $\"\"$ .

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$\"\"$

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$\"\"$ .