Ok, I'm supposed to find sin when cos = . The answer is . I got . Does this somehow simplify to the correct answer? it seems like it might, but my algebra skills are terrible.

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- November 15th 2012, 08:43 AMfogownzHelp with Trig Identities exercise. (unsolved)
Ok, I'm supposed to find sin when cos = . The answer is . I got . Does this somehow simplify to the correct answer? it seems like it might, but my algebra skills are terrible.

- November 15th 2012, 08:58 AMArythRe: Help with Trig Identities exercise.
Note:

. - November 15th 2012, 09:53 AMfogownzRe: Help with Trig Identities exercise.
Awesome, thank you.

Edit: Actually, I don't quite understand how it is determined that I know that it does, but how could I have gotten there. - November 15th 2012, 11:57 AMHallsofIvyRe: Help with Trig Identities exercise.
Do you know that ? And 8= (4)(2).

- November 15th 2012, 01:27 PMfogownzRe: Help with Trig Identities exercise.
Yes, but that doesn't really click for me. When I saw that, I tried applying the steps I saw to a different problem. (4)(4)=16, and , yet does not equal . There is something that I'm missing from this.

- November 15th 2012, 01:39 PMskeeterRe: Help with Trig Identities exercise.
note that

- November 15th 2012, 01:47 PMfogownzRe: Help with Trig Identities exercise.
Ah, alright, I got it. Thank you everyone for your help.