J
@Hatshepsut said:@Daniel15 said:Well, I was revising for a Maths exam tomorrow, and noticed this example question in a summary I was going through:
Using a compound angle formula, simplify tan(π/2 + x)
Here's what their working out looked like (reproduced by me in OpenOffice equation editor; I don't have a working scanner at the moment):
Interesting, to say the least. Talking ∞/∞ out as a common factor? :P If as the first step you express it as lim [A->pi/2] tan(A+x), you should be able to apply your approach, because you're taking out (tanA/tanA) instead of ∞/∞, and [i]then[/i] you apply the limit. No?So who set the question? Do you think they'd accept the ∞/∞ approach, or have they deliberately added that ∞ twist to catch people out? Ugh, I can hardly read it it's so bad. I always hated math problems where you had to un-simplify the problem before you could solve it, like changing the pi/2 here to a variable so you can use a limit to solve it. If my TA's in school were any indication, this TA would take marks off your limit method because the prof/answer key has a much simpler answer.