Hello all , I encouter a problem solving this one : We are given a conical pendulum with : V - tan. speed of particle m - mass of rotating particle g - gravity acceleration L - leght of the string We need to find CosA , T by what is given above !!! A- is the angle between the string and vertical line !!!! So : I wrote : tcosA=mg tsinA=mv^2/R R=LsinA but I can't present cosA without sinA or something Please Help !