Question

If A + B + C =pi and cos A = cos B cos C, then tan A =

Answer 1

Step-by-step explanation:

Given A+B+C=π⟹A=π−(B+C)

And also given cosA=cosBcosC

⟹cos(π−(B+C))=cosBcosC

⟹−cosBcosC+sinBsinC=cosBcosC

⟹sinBsinC=2cosBcosC

⟹tanBtanC=2

Answer 2

Step-by-step explanation:

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