285 degrees.
Difference formula
Sum formula
What is this problem about?
This problem is about finding the exact value of sums and differences using the sum and difference formulas. We find the exact values for sine, cosine, and tangent of the angle by figuring out what angles to use by adding/subtracting to the angle we want.
What must the reader pay close attention to in order not to make a mistake?
The reader must pay close attention to how the sum and difference formulas are used. They should also pay cloe attention to how we are able to find the angle we want by using addition/subtraction with the degrees of the unit circle. Remember that there are many options to finding the angle we want and they all lead to the same answer.
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