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Mathematics
Mathematics
Problem
Prove that:
tan
(
45
∘
+
θ
)
−
tan
(
45
∘
−
θ
)
=
2
tan
2
θ
\tan(45^\circ + \theta) - \tan(45^\circ - \theta) = 2 \tan 2\theta
tan
(
4
5
∘
+
θ
)
−
tan
(
4
5
∘
−
θ
)
=
2
tan
2
θ
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