Calculation: 9JaCti - 1
c^2 =
a^2+ b^2- 2* a* b* cos(α)
a^2+ b^2- 2* a* b* cos(α)
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c^2 = a^2+ b^2- 2* a* b* cos(α)$$c^{2}$$ = $$a^{2}+b^{2}-2\cdot a\cdot b\cdot cos(\alpha)$$
c = saknis( a^2+ b^2- 2* a* b* cos(α))$$c$$ = $$\sqrt {a^{2}+b^{2}-2\cdot a\cdot b\cdot cos(\alpha)}$$
a^2+ b^2- 2* a* b* cos(α))$$c$$ = $$\sqrt {a^{2}+b^{2}-2\cdot a\cdot b\cdot cos(\alpha)}$$