Tan -1 a -tan -1 b- where a -0- b -0- ab -1- is equal toA- tan -1a-b-1-a bB- tan -1a-b-1-a b-C- -tan -1a-b-1-a bD- None of these

The correct option is C =tan^ 1a+tan^ 1b=π+tan^ 1(a+b/1 ab ), as ab gt; 1 ...

tan -1 a +tan...

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$t a n^{- 1} a + t a n^{- 1} b$ , where a>0,b>0,ab>1, is equal to

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None of these

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