In order to compare the equation solvers on these models, let"s consider the following Maths SL exam question. Let"s look at only part (c). The answers to the previous parts are: (a) r=− 4 , (b) p=8,  q= π 12 .Therefore, to answer part (c) we need to solve for x in the equation 8cos( π 12 ( x−4 ) )+10=7 in the interval 0≤x≤20 .The entire question is worth 8 marks, and part (c) is worth...