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Show that: tan50-tan30-tan20=tan20.tan30...

Show that: `tan50-tan30-tan20=tan20.tan30.tan50`

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Prove that tan70=2tan50+tan20

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Prove that : tan15^@.tan25^@+tan25^@.tan50^@+tan50^@.tan15^@=1.

Prove that: (tan 60-tan 30)/(1+tan 60 tan 30)=tan 30

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

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

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