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Mathematics
Mathematics
Problem
Prove that
tan
2
θ
=
2
tan
θ
1
−
tan
2
θ
\tan2\theta=\dfrac{2\tan\theta}{1-\tan^{2}\theta}
tan
2
θ
=
1
−
tan
2
θ
2
tan
θ
, assuming
1
−
tan
2
θ
≠
0
1-\tan^{2}\theta\neq0
1
−
tan
2
θ
=
0
.
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