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Which identity is used to find the limit of (1 - cos x)/x at 0?
A1 - cos x = sin x
B1 - cos x = 2 sin^2(x/2)
C1 - cos x = tan^2 x
D1 - cos x = 2 cos^2(x/2)
Answer & Solution
Correct answer: B. 1 - cos x = 2 sin^2(x/2)
Replacing 1 - cos x by 2 sin^2(x/2) lets the sin x / x limit be applied.
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