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  • Explain solution RD Sharma class 12 chapter 19 Definite Integrals exercise Fill in the blanks question 12 maths

Explain solution RD Sharma class 12 chapter 19 Definite Integrals exercise Fill in the blanks question 12 maths

Answers (1)

Answer: \frac{1}{7}

Hint: You must know  \frac{d}{d x}(\tan x) \text { and } \int x^{n} d x

Given: \int_{0}^{\pi / 4} \tan ^{6} x \sec ^{2} x\; dx

Solution:  

I=\int_{0}^{\pi / 4} \tan ^{6} x \sec ^{2} x\; dx

Put

        \begin{aligned} &\tan x=t \\\\ &\sec ^{2} x \; d x=d t \end{aligned}

When \mathrm{x}=0, \mathrm{t}=0

When \mathrm{x}=\frac{\pi}{4}, \mathrm{t}=1

\begin{aligned} \mathrm{I} &=\int_{0}^{1} \mathrm{t}^{6} d t \\\\ &=\left[\frac{t^{7}}{7}\right]_{0}^{1} \end{aligned}

    \begin{aligned} &=\left[\frac{1}{7}-0\right] \\\\ &=\frac{1}{7} \end{aligned}

 

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