Digital ACT Math Practice Question #2118
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Period of sine/cosine is always $2\pi / B$. $2\pi / 4 = \pi/2$.
For a sine function $y = A\sin(Bx - C) + D$, the period is given by $T = \frac{2\pi}{|B|}$. Here $B = 4$, so the period is $\frac{2\pi}{4} = \frac{\pi}{2}$....
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