## NCERT Solutions for Class 11 Maths Chapter 3 – Trigonometric Functions Ex 3.4

#### Page No 78:

#### Question 1:

Find the principal and general solutions of the equation

#### Answer:

Therefore, the principal solutions are

*x*=and.
Therefore, the general solution is

#### Question 2:

Find the principal and general solutions of the equation

#### Answer:

Therefore, the principal solutions are

*x*=and.
Therefore, the general solution is, where

*n*∈**Z**#### Question 3:

Find the principal and general solutions of the equation

#### Answer:

Therefore, the principal solutions are

*x*= and.
Therefore, the general solution is

#### Question 4:

Find the general solution of cosec

*x*= –2#### Answer:

_{cosec }

_{x}

_{ = –2}

Therefore, the principal solutions are

*x*=.
Therefore, the general solution is

#### Question 5:

Find the general solution of the equation

#### Answer:

#### Question 6:

Find the general solution of the equation

#### Answer:

#### Question 7:

Find the general solution of the equation

#### Answer:

Therefore, the general solution is.

#### Question 8:

Find the general solution of the equation

#### Answer:

Therefore, the general solution is.

#### Question 9:

Find the general solution of the equation

#### Answer:

Therefore, the general solution is

_{}

^{}