Prove that tan- -tan- -tan- -tan-tan-tan- -sin - - - cos-cos-cos-

sin( α +β +γ #160; ) #160; =sin( α +β #160; ) #160; cosγ #160; +cos( α +β #160; ) #160; sinγ #160; =sinα #160; cosβ #160; co ...

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Cos(A+B)Cos(A-B)

Prove that ...

Question

Prove that $tan α + tan β + tan γ - tan α tan β tan γ = \frac{sin (α + β + γ)}{cos α cos β cos γ}$

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