The value of `(sin39^@)/(cos51^(@))+2(tan11^(@)tan31^(@)tan45^(@)tan59^(@)tan79^(@))-3(sin^(2)21^(@)+sin^(2)69^(@))` is-

Without using trigonometric tables,evaluate each of the following: (sec39^(0))/(cos ec51^(0))+(2)/(sqrt(3))tan17^(0)tan38^(@)tan60^(@)tan52^(@)tan73^(@)-3(sin^(2)31^(0)+sin^(2)59^(@))

Prove that : tan1^(@)tan11^(@)tan21^(@)tan69^(@)tan79^(@)tan89^(@)=1

The value of tan 31^(@) tan 32^(@)tan 33^(@)…tan 59^(@) is-

Find the value of sin^(2)30^(@)+cos^(2)60^(@)+tan45^(@) .

Find the value of sin^(2)30^(@)+cos^(2)60^(@)+tan45^(@) .

Evaluate : sin^(2)25^(@)+sin^(2)65^(@)+sqrt(3)tan5^(@)tan15^(@)tan30^(@)tan75^(@)tan85^(@)

Evaluate : sin^(2)25^(@)+sin^(2)65^(@)+sqrt(3)tan5^(@)tan15^(@)tan30^(@)tan75^(@)tan85^(@)