- Given cos x = 4/5, 0 < x < 90 Find sin 2x, cos 2x, tan 2x?

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A water supply reservoir has leakage, which kind of glue is effective for it? For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx? What is the surface area of a cylinder with holes in the side? Which better: AUTOCAD 3D or AUTODESK INVENTOR ?
For design/ drawing: pipeline, baseline/ metal frame, and pumps..? Please What am I saying with my eyes in this video? https://streamable.com/a1s0w?