Suppose that t is to be found from the formula upper t equals x (e superscript y baseline plus e superscript negative y baseline ), where x and y are found to be 5 and ln 5 with maximum possible errors of startabsolutevalue dx endabsolutevalue equals 0.2 and startabsolutevalue dy endabsolutevalue equals 0.02. estimate the maximum possible error in the computed value of t.