Hi guys, trying to find the exact value of any help much appreciated
Follow Math Help Forum on Facebook and Google+
Originally Posted by jvignacio Hi guys, trying to find the exact value of any help much appreciated Note that . Does this make sense?
Originally Posted by Chris L T521 Note that . Does this make sense? okay you lost me on the 3rd step..
Originally Posted by jvignacio okay you lost me on the 3rd step.. From the second step, you apply the half angle formula where in our case, . Does this clarify things?
Originally Posted by jvignacio Hi guys, trying to find the exact value of any help much appreciated Hi, jvignacio. To find the exact value of sin(pi/8), you need to know two things: The exact value of cos(pi/4) and the half-angle identity for sin(x). and since pi/8 is in Quadrant I, you need the positive value. Hope that helps!
Last edited by sinewave85; March 10th 2009 at 07:43 PM. Reason: Took out a Latex snafu.
Originally Posted by Chris L T521 From the second step, you apply the half angle formula where in our case, . Does this clarify things? You got two posts typed out while I unawares was wading through the jungle of Latex on one. Ah, redundancies.
Originally Posted by jvignacio Hi guys, trying to find the exact value of any help much appreciated A slightly alternatively approach is to note that . Let : . Re-arrange and solve for (the negative root solution is rejected - why?).
View Tag Cloud