- #1

- 217

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sin(x^2) = x^2 - x^6/3! + x^10/5! - x^14/7! ...

cos(x) = 1 - x^2/2! + x^4/4! - x^6/6! ...

So why does sin(x^2) + cos(x) = 1 + x^2/2! + x^4/4! + 121x^6/6! ...?

Thanks!

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- Thread starter IntegrateMe
- Start date

- #1

- 217

- 0

sin(x^2) = x^2 - x^6/3! + x^10/5! - x^14/7! ...

cos(x) = 1 - x^2/2! + x^4/4! - x^6/6! ...

So why does sin(x^2) + cos(x) = 1 + x^2/2! + x^4/4! + 121x^6/6! ...?

Thanks!

- #2

- 294

- 1

I get -121x^6/6!, other then that just give the fractions a common denominator and add.

- #3

- 217

- 0

- #4

- 294

- 1

- #5

- 217

- 0

Well the 1 + x^2/2! + x^4/4! is hopefully obvious.

Nope :\

- #6

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