ii> By using the cosine formula for vector similarity measure on neutrosophic elements.
The cosine formula for similarity measures which is defined in equation  has been used to find the degree of similarity and the ranking matrix has been evaluated.
j] and use cosine formula (equation ) for vector similarity measures on NS to find the similarity matrix.
Except for the sine and the cosine formula to solve triangles, the remaining identities can be obtained by using the following identities.
This completes the proof of all the trig identities that are used in trigonometric courses except for the sine and cosine formulas to solve a triangle.
is the Cosine Transform of a function f then we have the Poisson Summation Cosine Formula
For each selected document, we compute its similarity with the services by using the cosine formula