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[" Question "56],[" In a triangle "ABC,t...

[" Question "56],[" In a triangle "ABC,tan(A)/(2)=(5)/(6)" and "tan(C)/(2)=(2)/(5)," th "],[" (a) "a,b,c" are in A.P."],[" (b) "cos A,cos B,cos C" are in A.P."],[" (c) "sin A,sin B,sin C" are in A.P."],[" (d) "" and (c) both "]

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