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Solve the given question ↑↑Chapter - Differentiation Class - 11 th Thanks ^_^ ​

Answer»

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FORMULA TO BE IMPLEMENTED

1.

\displaystyle \: \frac{d}{dx} ( {x}^{n} ) = n \: {x}^{n - 1}

2.\displaystyle \: \frac{d}{dx} ( logx)= \frac{1}{x}

3.\displaystyle \: \frac{d}{dx} (uv \: ) =u \frac{dv}{dx} + v\frac{du}{dx}

TO EVALUATE

Differentiate : y = {x}^{2} \sqrt{x} + {x}^{4} \: logx

EVALUATION

LET u \: = {x}^{2} \sqrt{x} \: \: and \: \: v = {x}^{4} \: logx

\implies \: \displaystyle \: \frac{dv}{dx} = 4 {x}^{3} \: logx + {x}^{3}

So y = u + v

Differentiating both sides with respect to x

\displaystyle \: \frac{dy}{dx} = \frac{du}{dx} + \frac{dv}{dx}

Now

\displaystyle \: u \: = {x}^{2} \sqrt{x} = {x}^{(2 + \frac{1}{2} \: ) } = {x}^{ \frac{5}{2} }

Differentiating both sides with respect to x we get

\displaystyle \: \frac{du}{dx} = \frac{5}{2} {x}^{( \frac{5}{2} - 1)} = \frac{5}{2} {x}^{ \frac{3}{2} }

Again v = {x}^{4} \: logx

Differentiating both sides with respect to x we get

\displaystyle \: \frac{dv}{dx} = 4 {x}^{3} \: logx + {x}^{4} \times \frac{1}{x}

RESULT

\displaystyle \:  \frac{dy}{dx}  =  \frac{5}{2}  {x}^{ \frac{3}{2} }  + 4 {x}^{3}  \: logx \:  +  {x}^{3}



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