- How to simplify sec^2x(1-sin^2x) please.?

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Cos2x= cos^2x- sin^2x proof? Describe the main functions of the four classes of organic molecules? Evaluate (1/3)^3? If sin α=3/5, sinβ=5/13, a is in quadrant 1 and β is in quadrant 2, find sin(α+β).? Construct a polynomial function with the stated properties. Reduce all fractions to lowest terms.
Fourth-degree and a single zero of 3?

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