Part I. There are 5 problems in Part I, each worth 5 points. No partial credit will be given, so be careful. Circle the correct answer.

Transcription

1 Math 109 Final Exam-Spring 016 Page 1 Part I. There are 5 problems in Part I, each worth 5 points. No partial credit will be given, so be careful. Circle the correct answer. 1) Determine an equivalent expression for sin. a) sin θ b) cos θ c) sin θ d) cos θ e) Not a, b, c, or d ) If θ is an acute angle and a) 5 4 b) cos, what is sin? 5 4 c) 5 d) 4 5 e) Not a, b, c, or d 3) Find the dot product of u and v if,3 and 1, 1 a) 6 b) -1 c) <3, 3> d) 5 e) Not a, b, c, or d 4) Find an angle coterminal to a) 4 8 b) 11 8 c) 3 d) e) Not a, b, c, or d

2 Math 109 Final Exam-Spring 016 Page 5) Consider the following triangle. Find sin. 1/ 1/8 a) 4 b) 1/4 c) d) e) Not a, b, c, or d 6) Find the directrix of the parabola x 8( y 1). a) x= - b) x = c) y = -3 d) y = -1 e) Not a, b, c, or d 7) What is phase shift for the graph: 3sin 3 5 a) 5 b) 3/ c) 3 d) -3/ e) not a,b,c or d 8) Fill in the following chart using exact values. Sin 30 0 = radians 45 0 = radians 60 0 = radians Cos Tan

3 Math 109 Final Exam-Spring 016 Page 3 Part II. Partial credit will be given here. Show all your work. Each problem is worth 6 points. 9) Given u, 4 and vector v 1, 1, find the following: a) b) 10) Suppose that P is a point on a circle with a radius of 1 inches and the ray OP is rotating with angular speed 10 degrees per second. a) Find the speed in radians per second P O b) Find the distance travelled by P along the arc after 1 second (i.e. arc length) 11) Given cos x 0.3, state the solution set on [ 0,360 ). Approximate to nearest degree. Show all work clearly.

4 Math 109 Final Exam-Spring 016 Page 4 1) If the rectangular coordinates of a point are 1,1, what are its polar coordinates (r, θ) given the following. a) r 0, 0 b) r 0, 0 13) Write the trigonometric expression as an algebraic expression in terms of u (assuming u>0). 14) Simplify and write answer as a single term in terms of at most one trig function. a) b)

5 Math 109 Final Exam-Spring 016 Page 5 Part III. Partial credit will be given here. Show all your work. Each problem is worth 1 points. 15) Write an equation for each. Answer a) 5 b) Answer 1-5 4π π π π π -1 c) Graph f(x) = Label axes with at least ticks each.

6 Math 109 Final Exam-Spring 016 Page ) Givencos, andsin, 0. Evaluate each of the 4 3 following exactly (do not use any decimals!!). (1 pts) a) ) sin( b) cos 17) Verify (prove): cot( x) tan( x) sec( x)csc( x) include all steps and explanations (1 pts)

7 Math 109 Final Exam-Spring 016 Page 7 18) a) Graph the polar equation r 3cos on the axes below. (7 pts) r b) Convert the following polar form into rectangular form (no decimals!) (3, 10 0 ) (5 pts) 19) Solve the triangle ABC with sides a 5 cm, b 7 cm and c 10 cm. Round all answers to the nearest tenth (one decimal place). (1 pts) A= B= C=

8 Math 109 Final Exam-Spring 016 Page 8 0) Solve the following. Give EXACT answers (no decimals) a) Find all solutions to 4cos x 3 0. (6 pts) Note: All solutions are the same Express in terms of degrees. as general solutions. b) sin x 1 sin x on [ 0, ) (6 pts) (7 pts) (5 points) 1) a) Change y 4x x 6y into standard form. b) Write the equation of Identify the graph as an ellipse, circle, the following: parabola, or hyperbola and state the center.

9 Math 109 Final Exam-Spring 016 Page 9 PART IV. Here are 6 problems. Do any 4, but only 4. Each is worth 10 points. Be sure to check the box for each problem to be graded. If you do not check the boxes, the first 4 will be graded. ) Find cube roots of 1 i. Leave answers in trig form. 3) Graph the following. Indicate and label all critical information. y x Center: Vertices: Foci: Asymptotes:

10 Math 109 Final Exam-Spring 016 Page 10 (REMDINDER: Do 4 of the 6 problems in this section and check the box next to the ones I should grade!) 4) Solve the following system of equations. Show all work: x y xy ) Points A & B are on opposite sides of a lunar crater. Point C is 50 m from point A. The measure of angle BAC is 11 degrees and the measure of angle ABC is 38 degrees. What is the width of the crater (distance between A and B)? Round to the nearest tenth if needed.

11 Math 109 Final Exam-Spring 016 Page 11 (REMDINDER: Do 4 of the 6 problems in this section and check the box next to the ones I should grade!) 6) Prove the following identity: tan 7) Two forces of 38 N and 45 N act on objects at right angles. Round to the nearest tenth. a) Find the magnitude of the resultant vector b) Find the angle the resultant vector makes with the larger force.