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  4. If numerical value of tan cos -1 (4/5)+ tan -1 (2/3) is ( a / b ), then -

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Q. If numerical value of $\tan \left\{\cos ^{-1} \frac{4}{5}+\tan ^{-1} \frac{2}{3}\right\}$ is $\frac{ a }{ b }$, then -

Inverse Trigonometric Functions

Solution:

Correct answer is (a) $a+b=23$Correct answer is (b) $a-b=11$Correct answer is (c) $3 b=a+1$