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a little joke for the students
These functions are defined by reference to a "right triangle," which is a triangle in which one angle is 90 degrees.
These functions are defined by reference to a "right triangle," which is a triangle in which one angle is 90 degrees.
A way to remember the relationsships is the mnemonic SOH-CAH-TOA ("soak a toe"). Think of a man soaking his toe in a tub of water - preferably a three-sided tub!