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tan20^@+tan25^@+tan20^@.tan25^@=.......

`tan20^@+tan25^@+tan20^@.tan25^@=....`

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tan70^@-tan20^@-2tan40^@=

tan20^@tan40^@tan60^@tan80^@=

tan 20^(@) + tan 25^(@) +tan 20^@ tan25^(@)=

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

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

Prove that tan20^@tan30^@tan40^@tan80^@=1

tan20^@+tan40^@+sqrt3tan20^@tan40^@=

tan20^(@)tan40^(@)tan80^(@)

tan20^(@)+2tan50^(@)=

Identify the correct statement/s tan20^(@)+tan25^(@)+tan35^(@)=tan20^(@)tan25^(@)tan35^(@)