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Need help with this precalculus problem of fundamental identities: cos^2x+cos^2 x sec^2x? In the figure, A̅B̅ ll C̅D̅. Find x and y.? What is the simplified form of (2√5 + 3)(√5 -1)? How can the Distance and Midpoint Formulas be used to identify specfic polygons? Ex: how could you show that a quadrilateral is a rectangle? Solve 4t(t – 5) – 2t(3t + 2) + 108 = 3t(2t – 5) – t(8t – 3).?