$\"\"$

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The function is $\"\"$ and the point is $\"\"$ .

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

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

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Consider $\"\"$ .

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

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$\"\"$

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Consider $\"\"$ .

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

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$\"\"$

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$\"\"$

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

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Substitute $\"\"$ and $\"\"$ in chain rule.

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$\"\"$

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$\"\"$

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Slope of the tangent is derivative of the function.

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$\"\"$ .

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Slope of the tangent line at $\"\"$ .

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$\"\"$

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Slope of the tangent line is $\"\"$ .

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Point-slope form of line equation $\"\"$ .

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Substitute slope $\"\"$ and the point $\"\"$ .

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$\"\"$

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$\"\"$

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The equation of a tangent line $\"\"$ .