Cosine graphing question???? PLEASE help.
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Cosine graphing question???? PLEASE help.

[From: ] [author: ] [Date: 13-09-25] [Hit: ]
?Since the number before the cosine is a negative, shouldnt it be a downward curve instead?http://www.wolframalpha.com/input/?......
The equation is y= -2cos(3x-pi)-4.

WHY is the curve to the right of the starting point an upward curve instead of a downward curve??????

Since the number before the cosine is a negative, shouldn't it be a downward curve instead?

-
y= -2cos(3x-pi)-4
= -2cos3(x - pi/3) - 4
period = 2pi/3 => 1/2 period = pi/3
(x - pi/3) => horizontal shift right pi/3

http://www.wolframalpha.com/input/?i=plo…
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