EXAMPLE 23 Solve tan-1(x + 1) + tan...
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EXAMPLE 23 Solve tan-1(x + 1) + tan (x-1) = tan -tan- 18 31

11th - 12th Class
Maths
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sokumon We have But, ( x=-8 ) gives ( L H S=tan ^{-1}(-7)+tan ^{-1}(-9), ) which is ( n ) while RHS is positive. So, ( x=-8 ) is not possible. Hence, ( x=frac{1}{4} )
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