What is the range of #y = -2 cos 3x#?
1 Answer
Mar 30, 2018
Explanation:
We have to know the range of a normal
We next have to know what the translation form of cosine graphs looks like
A~Amplitude, stretches all the y values by A
B~Period, stretches the period by
C~ vertical translation, moves the x values across by C
D~ horizontal translation, moves the y values up D
So A and D effect the range and B and C effect the domain
So from this we know the y values have been stretched by -2 so the range becomes -2 and 2