H Intro to Cal Final Exam Review Spring 13.tst

68) Find the exact value of the expression.sin 255° cos 15° - cos 255° sin 15°A) - 1 2B) -32C) 174D)3269) Use the given information to find the exact value of the expression.Find cos (α - β). sin α = 7 25 , α lies in quadrant II, and cos β = 2 , β lies in quadrant I.5A)48 - 7 21125B)14 - 24 21125C)14 + 24 21125D)-48 + 7 2112570) Determine the amplitude or period as requested.Period of y = -2 sin 6πxA) 6π B) 1 3C) 3 D) π 371) Convert the angle in degrees to radians. Express answer as a multiple of π.-90°A) - π 3 radians B) - π 4 radians C) - π 2 radians D) - π 8 radians72) Use the given triangles to evaluate the expression. Rationalize all denominators .cos π 6A)22B) 3 C) 2 33D)3273) The point P on the unit circle that corresponds to a real number t is given. Find the values of the indicatedtrigonometric function at t.47 , - 33Find cos t.7A) 4 7B) - 4 7C) -337D)33714