Math question: Find the measure of angle PQR if angle PQR is bisected by line segment ST. (200 characters)Answer: In an isosceles triangle PQR with angle PQS bisected by ST, the measure of angle PQR is 90 degrees. This is because the angle bisector divides the angle into two congruent angles, which must sum up to 90 degrees in an isosceles triangle. (
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What are the amplitude, period, and range of the cosine function f(x) = cos x? (
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What is the derivative of y = 2x^3 + 4x^2 - 5x + 8?