Question

find the period and amplitude of the periodic function?
y = -5 cos 6x

Answer 1

\[\huge\rm y = a \cos (bx)\]
simple standard form
where a is amplitude
and
to find period
p = 2pi/b

Answer 2

Hmm. The amplitude of this function seems like -5. Because cos6x cannot get a value more then 1, so -5 times 1 equals -5. It swings back and forth between -5 and +5. But I am not sure about the period.