EXAMPLE 23 Solve tan-1(x + 1) + tan...
Question

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

11th - 12th Class
Maths
Solution
58
4.0 (1 ratings)
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} )