# EXERCISE 3.4(Trigonometric function)

Find the principal and general solutions of the following equations(Ex 3.4 Trigonomety ncert maths solution class 11)

Question 1: Solution: Given, Since ‘ ‘ positive in Ist and IIIrd quadrant

Then,  Hence the principal solution are Given,   Hence the general solution is Question 2: Solution: Given, Since ‘ ‘ positive in Ist and IVth quadrant

Then,  Since, Then,  General solution: Question 3: Solution: Given, Since, is negative in IInd and IVth quadrant

Then,  Given,  General solution: Question 4: Solution: Given,  is negative in IIIrd and IVth quadrant

Then,  Again, given that   Then general solution: Find the general solution for each of the following equations:

Question 5: Solution: Given General solution:

Using formula: Hence, Taking ‘+’ve sign    Taking ‘-‘ve sign    Question 6: Solution: Given,      Takaing    Taking,   Question 7: Solution: Given,       Question 8: Solution: Given,         Question 9: Solution: Given,          Ex 3.3 Trigonomety ncert maths solution class 11 