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theta is a variable, it's replacable

the word approaches is a pithier term for "tends to"

it's the same thing, i could dredge my old calc 1 books up if you would like a further explination



I'm sorry, but you just can't "replace" the use of variables and constants whenever you see it fit. There is something called discipline in mathematics.

For example, after evaluating an indefinite integral, the final answer always carries a +c term(called the constant of integration, since an indefinite integral, not having upper and lower limits, will never give a precise answer). Try writing something else instead of that +c, and most professors will look at you funny.

Fact of the matter - just like how in programming there are reserved words, so too in mathematics there are certain variables like x, theta, sigma, epsilon etc. which have their specific uses and cannot AND should not be used interchangeably.

Look above for," approaches is a pithier term for tends"

and yeah, you're talking to an engineer with a double major in computer and electrical engineering, although, admittedly, a recent grad