Explain solution RD Sharma class 12 chapter Determinants exercise multiple choise question 20 maths
Correct option (b)
Simply first solve the determinant.
Here the distinct real roots of
lies in the interval
We have to find the number of roots of the given determinant.
Applying C1→C1-C3; C2→C2-C3
Taking common cos sec x-sec sec x from column 1 and 2, we get
Expanding along R1 , we get
Hence, there are two solutions.