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 Oct15 awarded Popular Question Aug4 awarded Popular Question Jul2 awarded Curious Dec4 comment Cosine series of $x^3$ We're probably supposed to divide $a_n$ into $a_{2m}$ and $a_{2m-1}$ and then proceed, but I'm still not able to get in the form required. Dec4 revised Cosine series of $x^3$ added 131 characters in body Dec4 comment Cosine series of $x^3$ Not homework specifically, just practicing for an exam. Actually we're supposed to 'show that' the cosine series is equal to some particular series they've shown. I'm not able to get it into that form. I'll put that required series in the answer. Dec4 asked Cosine series of $x^3$ Dec3 comment Sine series of $\pi/2$ You're right, I just updated. Okay I'm beginning to figure this out. $pi/4$ is even in all intervals. $sinx$ is even in $(0,\pi)$. So their product will be even, hence I'll be able to find a sine series. Is this correct? Dec3 revised Sine series of $\pi/2$ added 142 characters in body Dec3 asked Sine series of $\pi/2$ Dec1 asked Recurrence relation for the number of ternary trings containing 2 consecutive zeros vs not containing Nov30 accepted Prove that $2^k > k^3$ for all $k\ge10$ Nov30 asked Prove that $2^k > k^3$ for all $k\ge10$ Nov27 comment Big Oh notation of $7x^2$, confused @Andre and Snowball: Okay, that makes sense. Wonder why this fact isn't clearly explained in the example that $O(x^3)$ isn't the most 'efficient' Big Oh notation for $7x^2$. And I've seen this example in 2-3 different places. Nov27 comment Big Oh notation of $7x^2$, confused I'm studying it under a course called Discrete Mathematics for Computer Science, hence I tagged it such. Nov27 awarded Editor Nov27 revised Big Oh notation of $7x^2$, confused added 2 characters in body Nov27 asked Big Oh notation of $7x^2$, confused Nov24 awarded Scholar Nov24 accepted Integrating using Laplace Transforms