Answer to Question #7146 in Calculus for maria pretty
what is fundamental law of trigonometry
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Anyway, the answer is that by "fundamental theorem of trigonometry" is often meant sin2(x) + cos2(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 a2 + b2 = c2 and therefore sin2(x) + cos2(x) = 1.
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