Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Which of the following expressions equals
cos
2
θ
\cos 2\theta
cos
2
θ
? a)
2
sin
θ
cos
θ
2\sin\theta\cos\theta
2
sin
θ
cos
θ
b)
2
cos
2
θ
+
1
2\cos^{2}\theta+1
2
cos
2
θ
+
1
c)
1
−
2
sin
2
θ
1-2\sin^{2}\theta
1
−
2
sin
2
θ
d)
1
+
2
sin
2
θ
1+2\sin^{2}\theta
1
+
2
sin
2
θ
Browse the problem library