...One topic covered in pre-calculus is the polar coordinate system. Using the definition of sine and cosine you can express the rectangular coordinates x and y as rcos(theta) and rsin(theta). Then, using the tangent and Pythagorean theorem, you can write polar coordinates in terms of rectangular. Trigonometry begins with a right triangle and the Pythagorean theorem.
Glencoe, ILView Tutor
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Addison, ILView Tutor
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Lisle, ILView Tutor
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Hobart, INView Tutor
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Chicago, ILView Tutor