Use cosacosb=1/2[cos(a+b)+cos(a-b)] to derive cosx+cosy=2cos(x+y/2)cos (x-y/2)

When you dilate a figure with a scale factor of 1/2, what will the dilated figure look like?                                                                                           a: the dilated figure will have side lengths that are half the length of the original side lengths.                                                                          b: the angles in the dilated figure will be half the measure of the original figure.                                                                                c: the dilated figure will have side lengths twice the length of the original.