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Anyway, the answer is that by "fundamental theorem of trigonometry" is often meant sin
2(x) + cos
2(x) = 1, it is actually the Pythagorean Theorem. if you have a right
triangle with a hypotenuse of one, sin(x) is one leg, and cos(x) is the
other. The Pythagorean Theorem states that a
2 + b
2 = c
2 and therefore sin
2(x) + cos
2(x) = 1.
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