If tan-1 1/2 + tan-1 2/11 = tan-1 'a', then value of 'a' will be (a) – InterviewSolution

1.	If tan-1 1/2 + tan-1 2/11 = tan-1 'a', then value of 'a' will be (a) 1/4(b) 1/2(c) 3/4(d) 1
Answer» Answer is (c) 3/4

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