Sure! Here's the new description with all links and additional text removed: Learn how to verify trigonometric identities by expanding the trigonometric expressions. When the given trigonometric expre ...
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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