Question

y=-3cos πx what is the period ?

Answer 1

the period is \[\frac{ 2\pi }{ \pi }=2\]

Answer 2

period is \[\frac{ 2\pi }{ b }\] whatever that b might be

Answer 3

answer key says that it's \[\frac{ 3\pi }{ 2 }\]

Answer 4

are you sure?

Answer 5

yes , that's why im confused too

Answer 6

then discard the book answer :D

Answer 7

ohh that's true too :P
would the graph be correct?

Answer 8

from the picture above yea i'd say so