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Multiple choice

The infinite series 1 + x + $\frac{x^2}{2!} + \frac{x^3}{3!} + \frac{x^4}{4!} + ......$corresponds to

  1. sec x

  2. ex

  3. cos x

  4. 1 + sin2 x

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Taylor series expansion for e^x is 1 + x + x^2/2! + x^3/3! + ...

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