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Which best explains why this triangle is or is not a right triangle?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Use the ratio test to determine whether ∑n=14∞n+2n! converges or diverges. (a) find the ratio of successive terms. write your answer as a fully simplified fraction. for n≥14, limn→∞∣∣∣an+1an∣∣∣=limn→∞.