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Answer to Question #6946 in Trigonometry for Akhtar Rasool

Question #6946
Dear Expert mathematicain,
what is the fundamentaal law of trigonometry?

best wishes,

Akhtar Rasool.
Expert's answer
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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