Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Find the sign of
cos
(
−
240
∘
)
\cos(-240^\circ)
cos
(
−
24
0
∘
)
. a) Positive b) Zero c) Negative d) Not defined
Browse the problem library