Posted by Subhotosh Khan on October 07, 2002 at 08:29:48:
In Reply to: limits posted by miguel on October 06, 2002 at 22:35:43:
: I can't seem to come up with the right answer for this problem. I'd appreciate any help.
: lim
: X->pi/4 (sinX - cosX)/cos2X
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(sinX - cosX)/cos2X
=(sinX - cosX)/[(cosX)^2 - (sinX)^2]
=(sinX - cosX)/[ (cosX - sinX)* (cosX + sinX)]
= -1/(cosX + sinX)
Take it from here....