In a spherical triangle abc, which angle c=90 so prove that Tan²b/2=tan(c+a)/2.tan(c-a)/2

In a spherical triangle abc, which angle c=90 so prove that Tan²b/2=tan(c+a)/2.tan(c-a)/2
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Видео In a spherical triangle abc, which angle c=90 so prove that Tan²b/2=tan(c+a)/2.tan(c-a)/2 канала maths