Need answers immediately, thank you in advance!

Sketch one cycle if the cosine function y=2cos2theta

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

Consider a= {x|x is alive} f={x|x is in france} m={x|x is a national monument} w{x|x is a woman}. which statements are true regarding elements of the given sets? check all that apply.