Question

cos^-1 rad2/2 cos^-1 (-rad3/2) PLEASE EXPLAIN

Answer 1

basically the question you need to ask yourself is: what angle of cos gives me rad2/2

Answer 2

what angle of cos gives me -rad3/2

Answer 3

its is helpful to remeber the unitcirlce and the know angles

Answer 4

But I know what those are i just dont understand question like rad 2/2 is 45 and idk would it just be negative 30 for the -rad3/2

Answer 5

basically just think of this:
if cos(45)=rad2/2, then cos inverse (rad2/2)=45

Answer 6

But i dont understand why what about for -rad3/2 what would inverse cos = -30

Answer 7

no it would be 5pi/6

Answer 8

:[ What exactly am i trying to find

Answer 9

you are trying to find out where cos is negative and equal to rad3/2

Answer 10

where is cos negative? in what quadrents?