cosine = adjacent/hypotenuse.
It can be used as other trig functions can.
Trigonometry
use the SohCahToa method
Yes, sine, cosine, tangent definitions are based on right triangles
Inverse of Cosine is 'ArcCos' or Cos^(-1) The reciprocal of Cosine is !/ Cosine = Secant.
You can choose either or but tangent which is sin/cos seems to be the most common way.
pen0r
It is cosine*cosine*cosine.
use the SohCahToa method
Trigonometry
Yes, sine, cosine, tangent definitions are based on right triangles
Inverse of Cosine is 'ArcCos' or Cos^(-1) The reciprocal of Cosine is !/ Cosine = Secant.
You can choose either or but tangent which is sin/cos seems to be the most common way.
Cosine of 1 degree is about 0.999848. Cosine of 1 radian is about 0.540302.
Tangent = sine/cosine provided that cosine is non-zero. When cosine is 0, then tangent is undefined.
That is how the scalar product is defined. Also, the projection of one vector onto another at an angle to it is directly proportional to the cosine of that angle.
The inverse of the cosine is the secant.
Reciprocal of Cosine is Secant