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# 使用simplify()化简from sympy import *import numpy as npL, alpha_r, f, pixcelSize, delta_y, theta = symbols(    "L alpha_r f pixcelSize delta_y theta")	# alpha_r=0时# diff_y = f*((pixcelSize*delta_y + f * tan(theta)) /#            (f-pixcelSize * tan(theta)*delta_y)-tan(theta))/pixcelSizealpha_r = 0diff_y = f*((pixcelSize*(delta_y+L*tan(alpha_r)) + f * tan(theta)) /            (f-pixcelSize * tan(theta)*delta_y+L*tan(alpha_r))-tan(alpha_r+theta))/pixcelSizeresult = simplify(diff_y)pprint(result, use_unicode=True) #打印标准格式