The variable in this equation is on the bottom of the cosine equation so that means we have to switch the two around and then put the variable on top of the cos number. Then divide as intended

This is also a cosine problem but this time all we have to do is put the x on the opposite side of the equation and then turn cos into an inverse cosine and do cosine 5/6

The variable is on the top for this one as well so all that has to happen is the inversion again as the problem anove