Cofunction identities **allow you to figure out the worth of a trigonometric operate given the value of the cofunction (of your purpose) at the angle that is complementary to your angle**. For occasion, you can conveniently come across cos(20°) if you know sin(70°) due to the fact sine and cosine are cofunctions and 70° + 20° = 90° .Sep 5, 2022

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