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

The cost of two tables and three chairs is $705. if the table costs $40 more than the chair,find the cost of the table and the chair

Right triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.