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Differentiate y=(e^(4x)tan x)/(ln x) with respect to x.

Differentiate y=e4xtanxlnx y=\frac{\mathrm{e}^{4 x} \tan x}{\ln x} with respect to x x .

Full solution

Q. Differentiate y=e4xtanxlnx y=\frac{\mathrm{e}^{4 x} \tan x}{\ln x} with respect to x x .
  1. Identify uu and vv: We need to differentiate the function y=e4xtan(x)ln(x)y=\frac{e^{4x}\tan(x)}{\ln(x)} with respect to xx. This will require the use of the quotient rule and the chain rule.\newlineThe quotient rule is given by ddx(uv)=v(dudx)u(dvdx)v2\frac{d}{dx}\left(\frac{u}{v}\right) = \frac{v\left(\frac{du}{dx}\right) - u\left(\frac{dv}{dx}\right)}{v^2}, where uu and vv are functions of xx.\newlineThe chain rule is given by ddx(f(g(x)))=f(g(x))g(x)\frac{d}{dx}(f(g(x))) = f'(g(x))g'(x), where ff and vv00 are functions of xx.\newlineLet's identify uu and vv for our function:\newlinevv44 and vv55.
  2. Differentiate uu: First, we differentiate uu with respect to xx using the product rule and the chain rule.\newlineThe product rule is (ddx)(fg)=f(g)+g(f)(\frac{d}{dx})(fg) = f'(g) + g'(f), where ff and gg are functions of xx.\newlineLet's differentiate e4xe^{4x} and tan(x)\tan(x) separately:\newline(ddx)(e4x)=4e4x(\frac{d}{dx})(e^{4x}) = 4e^{4x} (chain rule, since the derivative of uu00 is uu11, and here uu22).\newlineuu33 (since the derivative of tan(x)\tan(x) is uu55).\newlineNow apply the product rule:\newlineuu66\newline = e^{44x}\sec^22(x) + \tan(x)44e^{44x}.
  3. Differentiate vv: Next, we differentiate vv with respect to xx.v=ln(x)v = \ln(x), so (ddx)(v)=(ddx)(ln(x))=1x(\frac{d}{dx})(v) = (\frac{d}{dx})(\ln(x)) = \frac{1}{x} (since the derivative of ln(x)\ln(x) is 1x\frac{1}{x}).
  4. Apply quotient rule: Now we apply the quotient rule to find (dydx):(\frac{dy}{dx}):(dydx)=v(dudx)u(dvdx)v2(\frac{dy}{dx}) = \frac{v(\frac{du}{dx}) - u(\frac{dv}{dx})}{v^2}=(ln(x))(e4xsec2(x)+tan(x)4e4x)(e4xtan(x))(1x)(ln(x))2.= \frac{(\ln(x))(e^{4x}\sec^2(x) + \tan(x)4e^{4x}) - (e^{4x}\tan(x))(\frac{1}{x})}{(\ln(x))^2}.
  5. Simplify expression: We simplify the expression: (dydx)=(ln(x)e4xsec2(x)+ln(x)4e4xtan(x))(e4xtan(x)/x)(ln(x))2.(\frac{dy}{dx}) = \frac{(\ln(x)e^{4x}\sec^2(x) + \ln(x)4e^{4x}\tan(x)) - (e^{4x}\tan(x)/x)}{(\ln(x))^2}.
  6. Combine like terms: We can now combine like terms and simplify further: (dydx)=(ln(x)e(4x)sec2(x)+4e(4x)tan(x)ln(x)e(4x)tan(x)x)(ln(x))2(\frac{dy}{dx}) = \frac{(\ln(x)e^{(4x)}\sec^2(x) + 4e^{(4x)}\tan(x)\ln(x) - \frac{e^{(4x)}\tan(x)}{x})}{(\ln(x))^2}.
  7. Combine like terms: We can now combine like terms and simplify further: (dydx)=(ln(x)e4xsec2(x)+4e4xtan(x)ln(x)e4xtan(x)x)(ln(x))2(\frac{dy}{dx}) = \frac{(\ln(x)e^{4x}\sec^2(x) + 4e^{4x}\tan(x)\ln(x) - \frac{e^{4x}\tan(x)}{x})}{(\ln(x))^2}. This is the final derivative of yy with respect to xx. We have successfully differentiated the function using the quotient rule and the chain rule without making any mathematical errors.

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