Matematické Fórum

stuart clark · 28. 04. 2018 20:35

$\bigg(\sin(\alpha-\beta)+\cos(\alpha+2\beta)\sin(\beta)\bigg)^2=4\cos(\alpha)\sin(\beta)\sin(\alpha+\beta)$ .

Then prove that $\tan \alpha+\tan \beta = \frac{(\tan (\beta)}{(\sqrt{2}\cos(\beta)-1)^2}$

laszky · 05. 05. 2018 16:34 — Editoval laszky (05. 05. 2018 16:35)

↑ stuart clark:

Hi, try to reformulate it. I am sure, that for some pairs $[\alpha,\beta]$ is the implication valid, but for instance for $[\alpha,\beta]=\left[\frac{\pi}{2},\frac{\pi}{4}\right]$ the first equality holds, whereas the second does not.

stuart clark · 06. 05. 2018 15:18

Thanks ↑ laszky: i will conform ot from original source.

Matematické Fórum

#1 28. 04. 2018 20:35

Trigonometry

#2 05. 05. 2018 16:34 — Editoval laszky (05. 05. 2018 16:35)

Re: Trigonometry

#3 06. 05. 2018 15:18

Re: Trigonometry

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