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Question Number 75617 by mathocean1 last updated on 13/Dec/19

$$\mathrm{Demonstrate}\mathrm{that}\mathrm{\forall }\mathrm{x}\in ]0;\frac{\pi }{2}[$$$$\mathrm{tanx}=\frac{1-\cos \left(2\mathrm{x}\right)}{\sin \left(2\mathrm{x}\right)}$$

Commented by mind is power last updated on 13/Dec/19

$$\mathrm{use}\cos \left(2\mathrm{x}\right)=1-{2\sin }^2\left(\mathrm{x}\right)$$$$\mathrm{and}\sin \left(2\mathrm{x}\right)=2\sin \left(\mathrm{x}\right)\cos \left(\mathrm{x}\right)$$

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