The question as is written : Solve for x 5cosx-2= -0.72 ( 0 [tex]\leq[/tex] x [tex]\leq[/tex] 2[tex]\Pi[/tex] ) (The answer given is "1.31, 4.97".) So, i done what seemed natural. 5cosx-2=-0.72 5cosx = 1.28 cosx = 1.28/5 cosx = 0.256 Firstly, i'm not even sure what unit my answer is supposed to be in. Since x is defined as Radians in the question, my answer of .256 = .256pi Radians (.256 of 180)? Which should give solutions in the 1st & 4th quadrants. All of the questions untill (there are a bunch similar to this) these ones have been in the form of, for example, 4=5 - tan2x (x in radians), which, as there are no decimals in the solution work out easy (pi/8, 5pi/8).. . why, if x is defined in Radians in the question, are the answers in decimals? I dont understand the principle of this when decimals are involved for some reasons.