Are {{MATH_158}} and {{MATH_159}} the same function? {{CMD_160}} Let's use a series of steps to think about this question. First, what if we compare graphs? Here we see a graph of {{MATH_161}}: {{CMD_162}} {{ENV_163}} {{COMMENT_164}} {{COMMENT_165}} {{COMMENT_166}} {{COMMENT_167}} {{CMD_168}} On the other hand, here is a graph of {{MATH_169}}: {{CMD_170}} {{ENV_171}} {{COMMENT_172}} {{COMMENT_173}} {{COMMENT_174}} {{COMMENT_175}} {{CMD_176}} Second, what if we compare the domains? We cannot evaluate {{MATH_177}} at {{MATH_178}}. This is where {{MATH_179}} is undefined. On the other hand, there is no value of {{MATH_180}} where we cannot evaluate {{MATH_181}}. In other words, the domain of {{MATH_182}} is {{MATH_183}}.