Solve: two fifths plus seven fifteenths equals blank
Question 3 options:

thirteen fifteenths

nine fifteenths

nine twentieths

nine fifths

Sketch one cycle if the cosine function y=2cos2theta

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).