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 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.

triangle with a hypotenuse of one, sin(x) is one leg, and cos(x) is the

other. The Pythagorean Theorem states that a

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