The length of the rectangle is 16.
Answer:
4cos4x
Step-by-step explanation:
let's use cos
amplitude=4
period=pi/2
2pi/x=pi/2
x=4
no phase shift
y=4cos4x
pic from desmos
3w-13w=-20
Combine like terms
-10w=-20
divide both sides by -10
w=2
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