$ an \left[\cos ^{-1} \frac{4}{5}+ an ^{-1} \frac{2}{3} ight]$ is equal to

Question

$	an \left[\cos ^{-1} \frac{4}{5}+	an ^{-1} \frac{2}{3}ight]$ is equal to

Professor PC Thomas Classes · Answer

Simplifying using tangent addition formulas yields $\frac{17}{6}$.