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Values of Trigonometric Functions. Find the exact value of the trigonometric function.
Cosine and sine are negative in third quadrant, so the cotangent is positive in third quadrant.
Tangent is negative in fourth quadrant.
Write each trigonometric expression as an algebraic expression (that is, without any trigonometric functions).
Assume that x and y are positive and in the domain of the given inverse trigonometric function.
