# How can you tell whether the graph is a negative cosine graph or a positive sine graph?

Apr 26, 2015

Assuming you are comparing the graphs of
$y = - \cos \left(\theta\right)$
and
$y = \sin \left(\theta\right)$

for $\theta = 0$
$- \cos \left(\theta\right) = - 1$
and
$\sin \left(\theta\right) = 0$