MATLAB: Please help me to find out mathmatical function between X and Y

how to findout mathmatical function

for example
x=[0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.6 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.7 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.8 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1]
y=[89.72308444 89.21117298 88.69692085 88.18020302 87.66088218 87.13880655 86.61380705 86.08569379 85.55425157 85.0192342 84.48035703 83.9372872 83.38963067 82.83691475 82.27856424 81.71386818 81.14193297 80.56161474 79.97142004 79.36935656 78.75270387 78.11765265 77.45872388 76.7678153 76.03261795 75.23400847 74.34196715 78.30969848 77.07114557 75.9480519 74.94218396 74.03486878 73.20106164 72.41872047 71.67135281 70.94735035 70.23865101 69.53960043 68.84614818 68.15531367 67.46483672 66.77294781 66.07821495 65.37943962 64.67558442 63.96572164 63.24899546 62.52459342 61.79172401 61.04959825 60.29741384 59.53434075 58.75950745 57.97198693 57.17078199 56.35480903 55.52287962 54.67367898]

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