- Given that Sin angle= -3/5 and Tan angle > 0. Find Cos angle and Cot angle?

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If B is the midpoint of AC and AC= 8x-20. AB= 3x-1. Find BC.? Which valve is used in the construction site? And why? What is the magnification of a compound microscope with objective d eyepiece lenses of 0.8cm and 4cm,and the length of microscope is 15cm? Is there a difference between Protobionts and Protocells? Algebra question (possible roots)?