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cos(15 deg) = 0.9659, approx.
82.2 deg C = 179.96 deg F
59 degrees F.
The most basic example you can have entails adding the positive and negative of the irrational to get zero: e + -e = 0 Another example you can give is to use compound angle formulae with trig: sin(15 deg)cos(75 deg) + sin(75 deg)cos(15 deg) = sin(90 deg) = 1
15 degrees C