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If you mean 'sohcahtoa' then it is a memory aid for working out the properties of right angle triangles as follows:- Sine = opposite/hypotenuse Cosine = adjacent/hypotenuse Tangent = opposite/adjacent
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It means that the detail of the object or the object itself cannot be seen without the aid of a microscope. The smallest object that a human eye can see is 50 microns. Smaller than that is microscopic.
1. One way is to show the relationship between different components such as a resistor and a coil. That would be R+iXL. This shows that the coil impedence is 90 degrees out of phase with R resistance. 2. Another way we can use complex numbers is as an aid to visualize the complex fields around two conductors carrying current. Please refer to the RELATED LINK for a picture.