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Prove that tan 70=2tan 50+tan 20...

Prove that `tan 70=2tan 50+tan 20`

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Prove that tan70=2tan50+tan20

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Prove that tan70^0=2tan50^0+tan20^0

Prove tan 70^@=2tan 50^@+tan 20^@

Prove that tan 70^@=tan 20^@+2tan50^@

Prove that tan 70^@ = tan 20^@ + 2 tan 50^@ .

Prove that tan 70^@ = tan 20^@ + 2 tan 50^@ .

Prove that tan 70^@= tan 20^@+2 tan 50^@ .

Prove that : tan 20° tan 35° tan 45° tan 55° tan 70° = 1

Prove that tan70^(@)=2tan50^(@)+tan20^(@) .