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The cosine of theta is adjacent over hypotenuse, given a right triangle, theta not being the 90 degree angle, adjacent not being the hypotenuse, and theta being the angle between adjacent and hypotenuse.

In a unit triangle, i.e. in a unit circle circumscribed with radius one, and theta and the center of the circle at the origin, cosine of theta is X.

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Q: What ratio correctly describes the cosine function?

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Fora right angle triangle: cosine angle = adjacent/hypotenuse

In trigonometry, when we look at right triangles, the cosine is the ratio of the length of the adjacent side to the length of the hypotenuse.

phi = [(1+sqrt(5)]/2 = 1.6180, the golden ratio. cosine(phi) = -0.0472 approx.

The tangent is the ratio of sine over cosine; also, in a unit circle, Y over X.

a) sine

Related questions

The ratio of sine and cosine.

The cosine function is mathematical equation to determine the adjacent angle of a triangle. The cosine of an angle is the ratio of the length of the hypotenuse: so called because it is the sine of the co-angle.

In a right angle triangle it is: cosine ratio = adjacent/hypotenuse

In a right triangle, the sine of an (non right angle) angle would the ratio of the opposite side (opposite to the angle selected) and the hypotenuse

It is the cosine ratio.

one-to-one ratio

it would be secant, 1/cosine

one-to-one ratio

If the numerator is 0 AND the denominator is not 0, then the ratio is 0. And cosine of 0 is 1.

By doing it

A cosine is a trigonometric ratio and is not capable of liking or disliking anything!

In a specific angle for a right triangle the cosine ratio is the ratio between the lengths of the adjacent side (side touching the angle) and the hypotenuse (longest side).

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