Math question: Consider a circle with the equation x^2 + y^2 = r^2. If the radius, r, is 4 units, what are the possible values for the coordinates (x, y)?
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What is the sine value of π/4 in the unit circle?
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What is the value of f(x) when x = e^2, where f(x) = log(x) and f(x) = ln(x)?