Proof of lim xS0 cos x _ 1 x _ 0 Use the trigonometric
Chapter 3, Problem 73(choose chapter or problem)
Proof of lim xS0 cos x _ 1 x _ 0 Use the trigonometric identity cos2 x + sin2 x = 1 to prove that lim xS0 cos x - 1 x = 0. 1Hint: Begin by multiplying the numerator and denominator by cos x + 1.2
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