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posted by Moe Saturday, April 27, 2013 at 9:54pm.
The expression 4 - cos² A is equivalent to 1)5 - sec² A 2)5 - sin² A 3)5 + sin² A 4)5/sec² A
4 - (1-sin^2 A) so suspect another typo 4 + cos^2 A 4 + (1-sin^2 A) 5 - sin^2 A
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