Students can Download Maths Chapter 7 Integrals Ex 7.6 Questions and Answers, Notes Pdf, 2nd PUC Maths Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

## Karnataka 2nd PUC Maths Question Bank Chapter 7 Integrals Ex 7.6

### 2nd PUC Maths Integrals NCERT Text Book Questions and Answers Ex 7.6

Integrate the functions in Exercises 1 to 22.

Question 1.

x sin x

Answer:

∫ x sin x . dx

= x(-cosx) +∫ 1 x cos x dx

= – x cos x + sin x + C

Question 2.

x sin 3x

Answer:

Question 3.

x^{2}e^{x
}Answer:

∫ x^{2}e^{x}.dx

= x^{2}e^{x} -∫2x x e^{x} dx = x^{2}e^{x} -2(xe^{x} -1 x e^{x})

= x^{2}e^{x} – 2x e^{x} + 2e^{x} +C

= e^{x} (x^{2} – 2x + 2) + C

Question 4.

x log x

Answer:

Question 5.

x log 2x

Answer:

Question 6.

x^{2} log x

Answer:

Question 7.

x sin^{-1} x

Answer:

Question 8.

x tan^{-1} x

Answer:

Question 9.

x cos^{-1} x

Answer:

Question 10.

(sin^{-1 }x)^{2}

Answer:

Question 11.

\(\frac{x \cos ^{-1} x}{\sqrt{1-x^{2}}}\)

Answer:

Question 12.

x sec^{-2} x

Answer:

sec^{2}x

= x tan x -∫tan x + dx

= x tan x + log |cos x| +C

Question 13.

tan^{-1} x

Answer:

Question 14.

x(log x)^{2}

Answer:

Question 15.

(x^{2} + 1) log x

Answer:

Question 16.

e^{x} (sin x + cos x)

Answer:

∫e^{x} (sin x + cos x) dx

put f(x) = sin x

f’(x) = cos x

= ∫e^{x} (f(x) + f’(x)) dx = e’f(x) + C

=∫e^{x} (sinx + cosx) dx = e^{x }sin x + C

Question 17.

\(\frac{\mathbf{x} \mathbf{e}^{\mathbf{x}}}{(\mathbf{1}+\mathbf{x})^{2}}\)

Answer:

Question 18.

\(\mathbf{e}^{x}\left(\frac{1+\sin x}{1+\cos x}\right)\)

Answer:

Question 19.

\(e^{x}\left(\frac{1}{x}-\frac{1}{x^{2}}\right)\)

Answer:

Question 20.

\(\frac{(x-3) e^{x}}{(x-1)^{3}}\)

Answer:

Question 21.

e^{2x }sin x

Answer:

Question 22.

\(\sin ^{-1}\left(\frac{2 x}{1+x^{2}}\right)\)

Answer:

Question 23.

\(\int x^{2} e^{x^{2}} d x \text { equals }\)

Answer:

Question 24.

∫e^{x} sec x (1+ tan x) dx equals

(A) e^{x} cos x+ C

(B) e^{x} sec x+ C

(C) e^{x} sin x+ C

(D) e^{x} tan x+ C

Answer:

∫e^{x} sec x (1 + tan x) dx

= ∫e^{x} (sec x + sec x tan x) dx

put f (x 0 = sec x, f’ (x) = sec x tan x

= ∫ e^{x} (sec x + sec x tan x) dx = e^{x} sec x + C

Answer (B)