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Mathematics Forum
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| Author | Message / Information |
| Richard Kozik Quote | Reply | This message was updated on 2/26/2008 5:03:33 AM by Richard Kozik | Trig identities posted on: 2/26/2008 5:00:14 AM Howdy all! First I want to say thank goodness there are folks like you helpful ones who assists us, the mentally challenged, with our problems with Trig. Here is my problemo: Find the exact values of sin2 a (those're alpha characters), cos2 a and tan2 a; given this information: cos a = -(4/5) 90degrees < a < 180degrees. To be honest I am lost and shant know where to begin. I know I need to apply half-angle identities, right? I was told this falls into quadrant IV, but I don't know how the 90 to 180 deg information tells us that. Man I sure appreciate the help more than you know. Thnkx rich |
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