PHOENIX - The unemployment fraud crackdown in Arizona is tightening in December. Beginning Dec. 5, every person on unemployment in the state will have to prove their identity to continue to collect ...
Sec(a-b) = cos(a+b) / cos^2a - sin^2b I'm trying to prove this, by turning the left side into the right. I am stuck. Presumably you have already done the sum and difference formulas for sin and cos.
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