Target Exam

CUET

Subject

-- Mathematics - Section A

Chapter

Definite Integration

Question:

The value of $\int\limits_0^{100}\left[\tan ^{-1} x\right] d x$, is

Options:

100

100 - tan-1 1

100 - tan 1

none of these

Correct Answer:

100 - tan 1

Explanation:

We have,

$\int\limits_0^{100}\left[\tan ^{-1} x\right] d x =\int\limits_0^{\tan 1}\left[\tan ^{-1} x\right] d x+\int\limits_{\tan 1}^{100}\left[\tan ^{-1} x\right] d x$

$\Rightarrow \int\limits_0^{100}\left[\tan ^{-1} x\right] d x =\int\limits_0^{\tan 1} 0 d x+\int\limits_{\tan 1}^{100} 1 \cdot d x=100-\tan 1$