$\"\"$

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Consider $\"\"$ .

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$\"\"$ are the altitudes drops $\"\"$ and $\"\"$ , then $\"\"$ .

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where, $\"\"$ is the area of the triangle and $\"\"$ .

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Here $\"\"$ .

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Similarly,

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

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Consider $\"\"$ .

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Substitute $\"\"$ , $\"\"$ and $\"\"$ in the above equation.

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in the above equation.

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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$\"\"$ .