Question #6946

Dear Expert mathematicain,

what is the fundamentaal law of trigonometry?

best wishes,

Akhtar Rasool.

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

## Comments

## Leave a comment