Find the points on the curve y = x3 – 3x + 5 at which the tangent line is perpendicular to the straight line
a) (−2, 7), (2, 3)
b) (2, 7) (−2, 3)
c) (2, 3) (−2, 7)
d) (−2, −3)(−2, −7)
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