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[" If "tan(A+B)=p,tan(A-B)=q" then "Cot2...

[" If "tan(A+B)=p,tan(A-B)=q" then "Cot2B=],[" 1."(1+rq)/(p-q)quad 2*(1+n7)/(p+q)quad " 3."(1-pq)/(p-q)quad " 4."(1-nq)/(p+q)]

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