Krysten
Reputation
394
Top tag
Next privilege 500 Rep.
Access review queues
 May 4 comment How many permutations of a word do not contain consecutive vowels? How do you know that there are 7 spaces for the 5 vowels to go in? May 4 asked How many permutations of a word do not contain consecutive vowels? May 4 accepted How to prove that $(A\cup B) \cap C \subseteq A\cup (B\cap C)$ May 3 asked How to prove that $(A\cup B) \cap C \subseteq A\cup (B\cap C)$ Apr 29 accepted Find the arc length of the cardioid: r = 3-3cos θ Apr 29 comment Find the arc length of the cardioid: r = 3-3cos θ alright thanks! Apr 29 comment Find the arc length of the cardioid: r = 3-3cos θ Does the θ/2 come from the fact that the original trig identity is 1-cos(2x) = 2 sin^2 x and you need the θ/2 to cancel out with the 2x? Apr 29 accepted Find the area of the surface obtained by rotating the curve about the x axis Apr 29 asked Find the arc length of the cardioid: r = 3-3cos θ Mar 8 accepted How to sketch the curve of parametric equations Mar 8 comment How to sketch the curve of parametric equations alright. thanks for all your help :) Mar 8 comment How to sketch the curve of parametric equations i guess i was hoping for a "fast" solution, but i now know with parametric equations, there doesn't appear to be any simple or straightforward method. Mar 8 comment How to sketch the curve of parametric equations very informative! ok so basically, you want to analyze exactly what the functions x and y are doing and that will give you the complete curve. and the part of the unit circle that is graphed is the right half. Mar 8 comment How to sketch the curve of parametric equations sorry i had to finish editing my response Mar 8 comment How to sketch the curve of parametric equations i see now. so sin θ >= 0 and then sin θ <= 1. so x >= 0 and <=1? Mar 8 comment How to sketch the curve of parametric equations oh ok. so i could create a table of various points for t and then find the corresponding x and y values to determine the curve? Mar 8 comment How to sketch the curve of parametric equations oh ok. so essentially, you can just plot the initial point, the ending point to get the shape of the curve, and a point in between to determine the direction of the curve? Mar 8 asked How to sketch the curve of parametric equations Mar 8 comment Find the area of the surface obtained by rotating the curve about the x axis ahh now i see! thanks Mar 7 comment Find the area of the surface obtained by rotating the curve about the x axis After doing that I get: the integral from 0 to 1 of [(-2/pi) sqr(1 + u^2pi) du]. Would I have to do a trig substitution?