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Why the axis of beam slower down when entered in medium


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2.I have a question about how you show a reflection in the y-axis. It was shown by f(x)=(-x)^2 as opposed ...

sed tot he parent function f(x)=x^2 . My main question is why do we use this and when do we use this. (is a translation to the left considered the same thing?) I've only found 1 example other that the one I've shown you in the textbook, but it was with on Axis of symmetry at the origin so it really did nothing.
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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