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The problem statement suggests you use a calculator. A graphing calculator can give the answers you seek. a) The calculator shows 5 solutions: {5π/23, 5π/17, 25π/23, 25π/17, 45π/23} These have approximate decimal values of {0.6830, 0.9240, 3.4148, 4.6200, 6.1466} b) The calculator shows 2 solutions with approximate decimal values of {1.2925, 4.4341} c) The calculator shows 2 solutions with approximate decimal values of {1.3694, 4.9137} _____ This (desmos) calculator displays intercepts to 3 decimal places. Since you want 4 decimal places, some additional refinement of the answer was necessary. That was accomplished using Newton's method iteration. The details are not shown. A suitable graphing calculator (for example, a TI-84) will supply the intercept coordinates to full calculator accuracy.