This concept shouldn't be all that strange, actually. U-substitution is only one transformation technique, and in fact, you probably have already used other techniques of transformation to solve integration problems that haven't required the U-Substitution method. Here's an example: So this doesn't look too hard.
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Cuyahoga County Airport. Cuyahoga County Airport (IATA: CGF, ICAO: KCGF, FAA LID: CGF), also known as Robert D. Shea Field, is a public use airport in northeastern Cuyahoga County, Ohio, United States. Owned and operated by Cuyahoga County since 1946, it also serves Lake County and Geauga County. The airport is located 10 nautical miles (12 mi, 19 km) east of downtown Cleveland and sits on the border of three cities: Highland Heights, Richmond Heights and Willoughby Hills.