This problem is about using the sum and difference formulas of the 3 main trig functions. These formulas help us find the exact values of angles that are not apart of the magic five reference angles (0,30,45,60,90) by adding or subtracting two of the angles given in the unit circle to get the desired angle.
Pay close attention to the order of the variables and how I first found the exact values of cos,sin, and tan of the two angles. The order of the variables is crucial for one to obtain the correct answer when using certain formulas. The finding of the exact values helped me accelerate my finding of the exact values of the trig functions of the desired angle.
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