1. The unit circle is a type of circle centered at with radius 2. The equation of the unit circle is 3. The sign of a circular function of 8 depends on the in which the terminal side of the angle 0 lies. In quadrant II, sin 0 is (positiveegative) In quadrant III, cos 0 is (positiveegative) 4. Tangent and secant functions are undefined in what conditions? Explain your answer. 5. In what condition does cosine function is equal to 0? 6. When do tangent and cotangent function become negative? 7. How does the value of a affect the behavior of the graph of the function y = a sin bx? 8. How does the value of b affect the behavior of the graph of the function y = a sin bx? 9. What properties are common to the graphs of y = sin x and y = cos x? 10. Is the tangent function periodic? If so, what is its period