Which of the following is an identity? a. secx tanx - cosx cotx = sinx b. (tanx + cotx)(sinx cosx) = 1 c. sin2x = 4 - 2cos2x d. cosx(2sinx + 1) = 0

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

Sketch one cycle if the cosine function y=2cos2theta