Answer:
A, 2 is the y intercept not the zero
Answer:
90 degrees
Step-by-step explanation:
angle ABC is a right angle
no it isn't. 2cos(x) is 2 multiplied by cos(x), cos (2x) is cos(2 multiplied by x) meaning 2x is the angle you're taking the cosine of. if you want to know what cos(2x) look up the double angle rule.