Answer:
10
Step-by-step explanation:
Remember that

So if
and
, then we know
.
Then use the Pythagorean identity to solve for cosine:

You don't have all the numbers, you don't know what X equals, you need to know what X equals in order to complete the equation
it depends :/ like it depends on the class n shi but never ever skip 2 periods inna row cuz then
u too susss. also yes
writing random exp.
for points so dont come at me