Sketch the region of integration and convert the polar integral into cartesian integral or sum of cartesian integral. Don't evaluate:
∫π/6 0 ∫^2sec θ 0 r^5 sin 2θdrdθ
Hint : sin2θ = 2sinθcosθ

Sketch one cycle if the cosine function y=2cos2theta

If 25% of y is 30, what is 60% of y?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?