limₓ→∞ (x - sin x)/(x + cos x) equals

2008

limₓ→∞ (x - sin x)/(x + cos x) equals

  1. A.

    1

  2. B.

    -1

  3. C.

  4. D.

    -∞

Show answer & explanation

Correct answer: A

Evaluate
limₓ→∞ (x - sin x)/(x + cos x).

Divide numerator and denominator by x:
(x - sin x)/(x + cos x) = (1 - (sin x)/x)/(1 + (cos x)/x).

As x → ∞, sin x and cos x remain bounded, so
(sin x)/x → 0 and (cos x)/x → 0.

Therefore, the limit becomes
(1 - 0)/(1 + 0) = 1.

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