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How do you find the cosine?

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In any right triangle, the cosine of an angle is the length of the adjacent side (A) divided by the length of the hypotenuse (H). In a formula, it is written simply as ‘cos‘. Often remembered as “CAH” – meaning Cosine is Adjacent over Hypotenuse.

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Herein, how do you calculate cosine?

In any right angled triangle, for any angle:

  1. The sine of the angle = the length of the opposite side. the length of the hypotenuse.
  2. The cosine of the angle = the length of the adjacent side. the length of the hypotenuse.
  3. The tangent of the angle = the length of the opposite side. the length of the adjacent side.
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Similarly, what is tan equal to? The tangent of x is defined to be its sine divided by its cosine: tan x = sin x cos x . The secant of x is 1 divided by the cosine of x: sec x = 1 cos x , and the cosecant of x is defined to be 1 divided by the sine of x: csc x = 1 sin x .

Beside this, how do you find inverse cosine?

With inverse cosine, we select the angle on the top half of the unit circle. Thus cos1 (–½) = 120° or cos1 (–½) = 2π/3. In other words, the range of cos1 is restricted to [0, 180°] or [0, π]. Note: arccos refers to “arc cosine“, or the radian measure of the arc on a circle corresponding to a given value of cosine.

What is COS equal to?

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Always, always, the sine of an angle is equal to the opposite side divided by the hypotenuse (opp/hyp in the diagram). The cosine is equal to the adjacent side divided by the hypotenuse (adj/hyp).

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