“Express the trigonometric function value in terms of a trigonometric function of the associated reference angle. Then approximate the value by using a calculator.” No idea what the first sentence means. Here are the problems:
a. cos 151 degrees 21 minutes
b. sin (-98 degrees 24 minutes)
c. tan 196 degrees 42 minutes
If anyone can solve AND explain how to do this, then I am eternally in your debt. Or at least till this question expires.

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