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 Taylor series expansion for cos(x) is 1 - (x^2/2!) + (x^4/4!) - .... It contains only even powers of x and alternating signs. Option 103095 is sin(x), 103097 is exp(x), and 103098 is the expansion for 1/(1+x).

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