A car with worn shock absorbers hits a pothole and oscillated about its normal riding position. At time t (in seconds) the front bumper is distance d (in inches) above or below its normal position, where d=4sin(4t) - 2cos(4t). For what values of t (to the nearest tenth of a second) in the interval [0,4] is the front bumper at its normal position d=0? Edit View Insert Format Tools Table