Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Prove that
tan
2
θ
=
2
tan
θ
1
−
tan
2
θ
\displaystyle \tan 2\theta = \dfrac{2\tan\theta}{1-\tan^2\theta}
tan
2
θ
=
1
−
tan
2
θ
2
tan
θ
, where
tan
θ
≠
±
1
\tan\theta \neq \pm 1
tan
θ
=
±
1
.
Browse the problem library