Question
Question: Total number of solutions of 2<sup>C0SX</sup> =\|sinx\| in [-2π, 5π] is equal to...
Total number of solutions of 2C0SX =|sinx| in [-2π, 5π] is equal to
A
12
B
14
C
16
D
15
Answer
14
Explanation
Solution
Graphs of y = 2C0SX and y = |sinx| meet four times in
[0, 2π], Thus total number of solutions = 4 + 4 + 4 + 2 = 14.
