Prove that: tan 10 degrees + tan 35 degrees + tan 10 degrees * tan 35 degrees = 1
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We know
tan
45
∘
=
1
⇒
tan
(
35
∘
+
10
∘
)
=
1
⇒
tan
35
∘
+
tan
10
∘
1
−
tan
35
∘
tan
10
∘
=
1
⇒
tan
35
∘
+
tan
10
∘
=
1
−
tan
35
∘
tan
10
∘
⇒
tan
35
∘
+
tan
35
∘
tan
10
∘
+
tan
10
∘
=
1
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