Nah, you definitely did it better.

Correct me if I'm wrong (my high school trigonometry is a bit rusty), but doesn't that not actually change the answer since the cosine function is y-axis symmetrical?

@Lily Yeah that's correct. My trig teacher always told us: Cosine crushes, Sine slides. Crushes and slides the negative sign, that is.

this is better than the intel add imo, coz they just used some garbabe mathematics(the kind you see in big budget movie, oh its a gaussian we are all doomed and the like)

Ah the joke is better pulled of here than intel. Also, cos(-a) = cos(a) so you can laugh to the beach and get a tan ;)

But I hate it when someone goes to even the restroom in the middle of a math problem ;)

I prefer "find the limit of (e^lnx)/x, x->infinity. (hint: use l'hopital).

make sin(a) sin(-a). That'll teach him to not go to the bathroom during a simple math "problem". ^^

Quote:
"pku | April 15, 2010 6:27 AM | Reply

I prefer "find the limit of (e^lnx)/x, x->infinity. (hint: use l'hopital)."
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no need for l'hospital, cuz it's e^ln(x) = x
-> and x/x equals 1

This one had me laughing. A delightful twist on the old "change a sign" joke. His prank didn't work! :D Idiot...

this reminds me of the time i changed my friend's calculator from degrees to radians when he wasn't looking.

haha,it just make tan(a) no? :p very funny