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[" 6.If "cos A=m cos B" then "cot((A+B)/...

[" 6.If "cos A=m cos B" then "cot((A+B)/(2))cot((B-A)/(2))" is "],[[" (a) "(m-1)/(m+1)," (b) "(m+2)/(m-2)," (c) "(m+1)/(m-1)]]" (d) none of these "

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