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Question Number 158049 by zainaltanjung last updated on 30/Oct/21
Find derivative of this function  1). f(x)= x.sin x  2). f(x)= e^(5x) . log _2  (3x)  3). f(x)= 3^(3x) .(2x−1)  4). f(x)= ((3x^2 −2)/(4x+1))
$$\mathrm{Find}\:\mathrm{derivative}\:\mathrm{of}\:\mathrm{this}\:\mathrm{function} \\ $$$$\left.\mathrm{1}\right).\:\mathrm{f}\left(\mathrm{x}\right)=\:\mathrm{x}.\mathrm{sin}\:\mathrm{x} \\ $$$$\left.\mathrm{2}\right).\:\mathrm{f}\left(\mathrm{x}\right)=\:\mathrm{e}^{\mathrm{5x}} .\:\mathrm{log}\:_{\mathrm{2}} \:\left(\mathrm{3x}\right) \\ $$$$\left.\mathrm{3}\right).\:\mathrm{f}\left(\mathrm{x}\right)=\:\mathrm{3}^{\mathrm{3x}} .\left(\mathrm{2x}−\mathrm{1}\right) \\ $$$$\left.\mathrm{4}\right).\:\mathrm{f}\left(\mathrm{x}\right)=\:\frac{\mathrm{3x}^{\mathrm{2}} −\mathrm{2}}{\mathrm{4x}+\mathrm{1}} \\ $$
Answered by MathsFan last updated on 30/Oct/21
1. f′(x)=x•(dy/dx)sinx+sinx(dy/dx)x      f′(x)=xcosx+sinx
$$\mathrm{1}.\:\mathrm{f}'\left(\mathrm{x}\right)=\mathrm{x}\bullet\frac{\mathrm{dy}}{\mathrm{dx}}\mathrm{sinx}+\mathrm{sinx}\frac{\mathrm{dy}}{\mathrm{dx}}\mathrm{x} \\ $$$$\:\:\:\:\mathrm{f}'\left(\mathrm{x}\right)=\mathrm{xcosx}+\mathrm{sinx} \\ $$
Answered by MathsFan last updated on 30/Oct/21
4. f′(x)=(((4x+1)(6x)−(3x^2 −2)(4))/((4x+1)^2 ))      f′(x)=((6x−6x^2 +8)/((4x+1)^2 ))
$$\mathrm{4}.\:\mathrm{f}'\left(\mathrm{x}\right)=\frac{\left(\mathrm{4x}+\mathrm{1}\right)\left(\mathrm{6x}\right)−\left(\mathrm{3x}^{\mathrm{2}} −\mathrm{2}\right)\left(\mathrm{4}\right)}{\left(\mathrm{4x}+\mathrm{1}\right)^{\mathrm{2}} } \\ $$$$\:\:\:\:\mathrm{f}'\left(\mathrm{x}\right)=\frac{\mathrm{6x}−\mathrm{6x}^{\mathrm{2}} +\mathrm{8}}{\left(\mathrm{4x}+\mathrm{1}\right)^{\mathrm{2}} } \\ $$

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