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I suggest that it is (sin A)^2 + (cos A)^2 = 1

Q: What is the ''magic identity'' in trigonometry?

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An identity is like an equation which is true for all values of the variable.

plane trigonometry spherical trigonometry

The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.

Hipparchus is the father of trigonometry.

Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.

Related questions

An identity is like an equation which is true for all values of the variable.

Trigonometric identities are trigonometric equations that are always true.

plane trigonometry spherical trigonometry

csc(x) = 1/sin(x) = +/- 1/sqrt(1-cos^2(x))

The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.

It is a number - in trigonometry or elsewhere.

TRIGONOMETRY

Hipparchus is the father of trigonometry.

Trigonometry is applied in construction and building, as trigonometry measures right angled triangles.

Plane trigonometry is trigonometry carried out in (on) a plane. This could be contrasted with spherical trigonometry, which is trigonometry carried out on the surface of a sphere. Certainly there are some other more complex forms of trig.

Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.

trigonometry is very imr