Odisha State Board Elements of Mathematics Class 12 Solutions CHSE Odisha Chapter 9 Integration Ex 9(h) Textbook Exercise questions and Answers.

## CHSE Odisha Class 12 Math Solutions Chapter 9 Integration Exercise 9(h)

Evaluate the following Integrals.

Question 1.

(i) ∫\(\frac{d x}{4+5 \cos x}\)

Solution:

(ii) ∫\(\frac{d x}{3+\cos x}\)

Solution:

(iii) ∫\(\frac{d x}{3+\sin x}\)

Solution:

(iv) ∫\(\frac{d x}{1+2 \sin x}\)

Solution:

(v) ∫\(\frac{d x}{2 \sin x+3 \cos x}\)

Solution:

(vi) ∫\(\frac{d x}{1+\cos x+\sin x}\)

Solution:

Question 2.

(i) ∫\(\frac{3 \sin x+28 \cos x}{5 \sin x+6 \cos x}\) dx

Solution:

(ii) ∫\(\frac{12 \sin x-2 \cos x+3}{\sin x+\cos x}\) dx

Solution:

Let 12 sin x – 2 cos x = A (sin x + cos x) + B ( cos x – sin x)

[Note that cos x – sin x is the derivative of sin x + cos x]

Then A – B = 12, A + B = -2

⇒ 2A = 10

⇒ A = 5, B = -7

Thus 12 sin x – 2 cos x = 5 (sin x + cos x) – 7 (cos x – sin x)

(iii) ∫\(\frac{5 \sin x}{3-2 \sin x}\) dx

Solution:

(iv) ∫\(\frac{2 \cos x+7}{4-\sin x}\) dx

Solution:

Question 3.

(i) ∫\(\frac{d x}{2 \cos ^2 x+3 \cos x}\)

Solution:

(ii) ∫\(\frac{d x}{4 \sin ^2 x-\sin x}\)

Solution:

(iii) ∫\(\frac{\sin x \cos x}{x \sin ^2 x-2 \sin x+3}\) dx

Solution:

(iv) ∫\(\frac{d x}{\cos x-\cos 3 x}\)

Solution:

Question 4.

(i) ∫\(\frac{d \theta}{4+3 \sin ^2 \theta}\)

Solution:

(ii) ∫\(\frac{d \theta}{2-3 \cos ^2 \theta}\)

Solution:

(iii) ∫\(\frac{d \theta}{4 \cos ^2 \theta+9 \sin ^2 \theta}\)

Solution:

(iv) ∫\(\frac{d \theta}{2+3 \cos ^2 \theta-4 \sin ^2 \theta}\)

Solution:

Question 5.

(i) ∫\(\frac{\sin 3 x}{\cos 7 x \cos 4 x}\) dx

Solution:

(ii) ∫\(\frac{\cos 2 x}{\sin 7 x \cos 5 x}\) dx

Solution:

Question 6.

(i) ∫\(\frac{d x}{\cos x(5+3 \cos x)}\)

Solution:

(ii) ∫\(\frac{d x}{\cos x(1+2 \sin x)}\)

Solution: