... (4 times)   ... (twice)   (move the cursor near the zero)

The x-intercepts for the cycle shown are approximately x = 1.75 and x = 2.17, rounding to two decimal places. Since the period is π/2, all of the zeros can be expressed as 1.75 + kπ/2 and 2.17 + kπ/2, where k is any integer.

From the graph for this cycle, we observe that the y-values will be positive if x < 1.75 or if x > 2.17, and will be negative if 1.75 < x < 2.17. Therefore, f(x) > 0 on the interval and f(x) < 0 on the interval (1.75, 2.17), approximately.