Differentiation - Revision (1 Viewer)

xwrathbringerx · Nov 17, 2009

Hey guys

Could someone please show me how to do these differentiation questions. I know the basics but these are out of my league...

(1)

(2)

tommykins · Nov 17, 2009

$\text{Let }u = \frac{1}{x}\text{ so }\frac{du}{dx} = \frac{-1}{x^2}\\ \text{Then }y = \cos^{-1}(u) \to \frac{dy}{dx} = \frac{dy}{du}\frac{du}{dx} \to \frac{1}{x^2\sqrt{1-u^2}}\to \frac{1}{x^2\sqrt{1-\frac{1}{x^2}}}$
Same for 2)

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Differentiation - Revision (1 Viewer)

xwrathbringerx

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tommykins

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