Multiple choice general knowledge math & puzzles

Expansion of cos(x) is

  1. x-(x^3)/3!+(x^5)/5!-....

  2. 1-(x^2/2!)+(x^4/4!)-....

  3. 1+x+(x^2)/2!+(x^3)/3!+...

  4. 1-x+x^2-x^3+....
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Maclaurin series for cos(x) contains only even powers of x with alternating signs, starting with 1. Option A is the series for sin(x) (odd powers only), Option C is e^x (all positive terms), and Option D is a geometric series.

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