Choose the correct answer in each of the following questions:
`tan 10^(@) tan15^(@)tan75^(@)tan80^(@)=?`

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

tan20^(@)tan40^(@)tan60^(@)tan80^(@)=?

tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

Choose the correct answer in each of the following questions: "cosec"^(2)57^(@)-tan^(2)33^(@)=?

Choose the correct answer in each of the following questions: If x tan 45^(@)cos60^(@)=sin 60^(@) cot60^(@) " then " x=?

tan20^(@)tan40^(@)tan60^(@)tan80^(@)

Choose the correct answer in each of the following questions: (cos38^(@)"cosec"52^(@))/(tan18^(@)tan35^(@)tan60^(@)tan72^(@)tan55^(@))=?

tan15^(@) + tan 75^(@)=

tan10^@tan15^@tan75^@tan80^@ is

The value of tan10^(@)tan15^(@)tan75^(@)tan80^(@) is