Question
Match the function with its graph (a-j).$$y=-2 \cos \left(\frac{1}{2} x\right)$$
Step 1
This is a cosine function with an amplitude of 2 (the coefficient of the cosine function) and a period of $4\pi$ (the reciprocal of the coefficient of $x$ multiplied by $2\pi$). The negative sign indicates that the function is reflected over the x-axis. Show more…
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