), we can use the properties of the inverse tangent (or arctangent) function. Specifically, we will use the formula related to the difference of two arctangents: tan−1(x)−tan−1(y)=tan−1(‌
x−y
1+xy
) For our problem, let's set x=‌
a
b
and y=‌
a−b
a+b
. Substituting these values into the formula above, we get: tan−1(‌
a
b
)−tan−1(‌
a−b
a+b
)=tan−1(‌
‌
a
b
−
ab
abb
1+(‌
a
b
)(‌
ab
a+b
)
) To simplify this expression, we need to find a common denominator for the numerator and simplify the denominator as follows: The numerator: ‌