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Question

tan1a+tan1b, where a>0,b>0,ab>1, is equal to

A
tan1a+b1ab
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B
tan1a+b1abπ
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C
π+tan1a+b1ab
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D
none of these
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Solution

The correct option is D π+tan1a+b1ab
Given, tan1(a)+tan1(b)
=tan1(a+b1ab)
However, ab>1
Therefore,
π+tan1(a+b1ab)

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