If you are not strong with the unit circle, it is important that you memorize the angleEvaluate the following. The angle is not commonly found as an angle to memoriWrite the expression in terms of common angles. We know the cosine and sine of cUse the sum/difference identity to separate the angles. See more

Draw the angle, look for the reference angle. Use special triangles or the unit circle. Check the quadrant to determine the sign (+ or -). Trigonometry - Solving exact values of sin, cos, tan

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