I saw the solution on this site but I couldnt understand wh

I saw the solution on this site but , I couldn\'t understand why this picture has vector form F as 50(cos15i - sin15k ).

I know 50 is F value but I couldn\'t find out why it has (cos15i - sin15k ) which are Fx ,Fz values.

Please help me how to find them out.

Solution

There is no pictures attached

But here is a small explanation that I got from your query

Cos15 is the force component in x direction i . e ( I -X j- Y k- Z ) is vector notation

And sin15 is the force component in z direction