Question

Find the domain, period, range, and amplitude of the cosine function. y = -6cos4x

Answer 1

well in general for cos

if y = acos(bx) the amplitude is a

the period is \[\frac{2\pi}{|b|}\]

the range is -a to +a and the domain for cos is all real x

hope this helps

Answer 2

i'm still confused on the amplitude. i understand everything else. is it 6? @campbell_st

Answer 3

ok... so here is a simple explanation of the -6