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Feb19-12, 06:59 PM
P: 54
How to find the exact value of cos 67.5 ?

>>How is Cos(x) related to Cos(x+90), how
yeah, that definitely makes it simpler

>>Try multiplying both the top and bottom by
I have tried, but I seem to end up with a square root I can't get rid of, but I will keep trying.

Thanks for your help
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