Answer:
B: shift vertically up by 3
Step-by-step explanation:
I suggest using desmos graphing for future questions like these
Hope this helps :)
Write out the sum formula for sin
<span>sin(x + y) = sinxcos + sinycosx </span>
<span>Then expand sin(a + b) + sin(a - b) </span>
<span>sinacosb + sinbcosa + sinacosb - sinbcosa </span>
<span>The 2nd and 4th terms cancel and you get </span>
<span>2sinacosb</span>
I think it's the second one on the top, because the dotted one is actually inside the bigger one and you can get a clear representation of the sizes.
