$\"\"$

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The composite function is $\"\"$ .

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$\"\"$ is in the form of composite function $\"\"$ .

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Definition of composite function :

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The notation $\"\"$ means that the function $\"\"$ is applied first and then $\"\"$ is applied.

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Consider $\"\"$ .

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$\"\"$ .

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From the above expression, $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Differentiate on each side with respect to $\"\"$ .

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Chain Rule of derivatives: $\"\"$ .

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Derivative of the cotangent function: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ \ \

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$\"\"$

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

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$\"\"$ .