Cosine
On the unit circle, cos = x. it is positive in quad I and IV and is negative in quad II and III.
Problem 1 (easy): Given the coordinates (1/2, √3/2), determine the cosineof that angle.
Problem 2 (medium): Evaluate the trigonometric function cos(8Π/3).
Problem 3 (hard): Use the value of the trigonometric function to evaluate the following functions.
cos t =4/5
cos(Π - t) = ?
cos(t + Π) = ?
Problem 4 (applied): A plane takes off at 25 degrees above the horizontal going 100 mph. how fast would an object moving along the ground have to go to stay directly below the plane?
Problem 1 (easy): Given the coordinates (1/2, √3/2), determine the cosineof that angle.
Problem 2 (medium): Evaluate the trigonometric function cos(8Π/3).
Problem 3 (hard): Use the value of the trigonometric function to evaluate the following functions.
cos t =4/5
cos(Π - t) = ?
cos(t + Π) = ?
Problem 4 (applied): A plane takes off at 25 degrees above the horizontal going 100 mph. how fast would an object moving along the ground have to go to stay directly below the plane?