What is the equation to find the area of a circle with a radius of 5 units?
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Math question: In a triangle ABC, side AB measures 10 cm, side BC measures 15 cm, and angle C measures 60 degrees. Find the length of side AC using the Sine Law.
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Math question: What is the limit of (2x^3 - 5x^2 + 3) as x approaches -2?