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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.? Use complete sentences to describe the domain of the cosine function.? If someone gets $4.95 off a shirt that was originally $24.94, what percentage did they get off? How many squares are needed?