Simplify the expression cos^2(x/2-2)/ sqrt 1 - sin^2 (x)
a) tan(x)
b) cos(x) tan(x)
c) cos(x) cot(x)
d) sin(x) tan(x)

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same