[(2)/(-13=pi=2[tan^(-1)1+tan^(-1)(1)/(2)...

[(2)/(-13=pi=2[tan^(-1)1+tan^(-1)(1)/(2)+tan^(-1)(1)/(3))],[((bc+1)/(b-c))+cot^(-1)((ca+1)/(c-a))=0(CBsin C)" (g) Show "],[qquad [" (A) Find "],[" the the shoo "]]

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