1. The problem statement, all variables and given/known data A crane is used to lift a concrete pipe weighing 5kN into place. 2. Relevant equations 3. The attempt at a solution The picture is in my book, but i am certain my problem is in my algebra(i have the layout correct) T_ac*cos(20)=T_ab*sin(3.58) X direction 5+T_ac*sin(20)=T_ab*cos(3.58) Y direction I am for some reason drawing a blank when it comes to how i can work this out, i tried solving for T_ac in equation 1 then plugging that into equation 2 but then i am running into an algebraic nightmare. One other problem aswell(its part of the question) I am given a triangle where Hypotenuse=4m and opposite=.25m, so using A^2+b^2=c^2 i got 3.99 for b. Then i used theta=arccos(adjacent/hypotenuse)=4.05, but for theta=arcsin(opposite/hypotenuse)=3.58. What am i doing wrong?