The value of the expression `tan13^(@)tan27^(@)+tan27^(@)tan50^(@)+tan50^(@)tan13^(@)` is equal to

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tan10^(@)-tan50^(@)+tan70^(@)

tan50^(@)-2tan10^(@)=

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

tan10^(@)-tan50^(@)+tan70^(@)=?

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=?

tan9^(0)-tan27^(0)-tan63^(@)+tan81^(@)

sec 50^(@) + tan 50^(@) is equal to

Evaluate: tan35^(@)tan40^(@)tan45^(0)tan50^(@)tan55^(@)