Final Exam: Precalculus
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1 Final Exam: Precalculus Apr. 17, 2018 ANSWERS Without Notes or Calculators Version A 1. Consider the unit circle: a. Angle in degrees: What is the angle in radians? What are the coordinates? b. Coordinates: What is the angle in degrees? What is the angle in radians? 2. Evaluate / simplify each expression: a. b. Version B 1. Consider the unit circle: a. Angle in degrees: What is the angle in radians? What are the coordinates? b. Coordinates: What is the angle in degrees? What is the angle in radians?
2 2. Evaluate / simplify each expression: a. b. Regular Problems Version A 3. Graph the function. Show at least two complete cycles. 4. Solve the equation : CORRECTION: a. using the co sine inverse function (calculator answer) b. for or
3 c. for all where or is any integer 5. Simplify this rational expression: 6. Simplify and state the excluded values:
4 7. Make a table and graph for the function. Bonus: What is the inverse of this function? Answer with table, graph, and equation. 8. Simplify and rewrite this logarithmic expression more than one way: Note: Simply writing a calculator answer is not enough.
5 9. Evaluate / simplify each logarithm expression. Justify your answer by rewriting the equation into exponential form. a. because b. because 10. Solve for : 11. If, show that.
6 Version B Regular Problems 2. Graph the function. Show at least two complete cycles. 3. Solve the equation : CORRECTION: a. using the cosine inverse function (calculator answer) b. for or c. for all where or is any integer
7 4. Simplify this rational expression: 5. Simplify and state the excluded values:
8 6. Make a table and graph for the function. Bonus: What is the inverse of this function? Answer with table, graph, and equation. 7. Simplify and rewrite this logarithmic expression more than one way: Note: Simply writing a calculator answer is not enough.
9 8. Evaluate / simplify each logarithm expression. Justify your answer by rewriting the equation into exponential form. a. because b. because 9. Solve for : 10. If, show that. Conceptual Questions Note: The numbering here follows Version A which is the correct numbering. 12. Explain the meaning and purpose of each of the following concepts in your own words: a. the unit circle The unit circle is a tool to help us remember the trigonometric ratios and evaluate trig functions for all the special angles related to the and triangles. It is called the unit circle because the radius of the circle (the hypotenuse of each triangle) is one.
10 b. factors / factoring Factors are the numbers that multiply to make another number (the product). Factoring is the procedure of breaking up a product into its factors. In algebra, factoring is important for simplifying rational expressions as well as solving certain polynomial equations. c. excluded value An excluded value is a certain number (value) that a variable cannot assume because it would make the overall expression undefined. It is important to state excluded values when cancelling a variable factor out of a denominator since dividing by zero is undefined. d. logarithm A logarithm is the exponent needed on a given base in order to make the given result. A logarithmic function and exponential function of the same base are inverse to each other. 13. Each of the following contains a mistake. Describe the error. a. Graphing : All the transformations are correct, but the graph is showing the sine function, which starts in the middle, rather than the cosine function, which starts at the top. b. Simplifying a rational expression: The error is cancelling out the when it is being added, not multiplied. You can only use division to cancel multiplication, not addition. c. Simplifying a logarithmic expression: To use the properties of logarithms such as the quotient property, the base of the logarithms must be equal.
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