Question 6

How many real value(s) of $x$ satisfy the equation $|b| =|b \sin{\left(4x\right)}|$ where $x \in [0, 2\pi]$ and $b$ is not zero?

A. 1

B. 2

C. 4

D. 8

Solution

For this equation to be satisfied, $\sin{\left(4x\right)} = \pm 1$.

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