Find the value of `tan 56^(@)-tan 11^(@)-tan 56^(@).tan 11^(@)`

Find the value of tan56^(@)-tan11^(@)-tan56^(@).tan11^(@) .

Prove that tan A. (tan 60^(@) +A). Tan (60^(@)-A)=tan 3A and hence find the value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) .

Find the value of tan 100^(@)+tan125^(@)+tan 100^(@). Tan 125^(@) .

Find the value of tan 10 ^(@) +tan35^(@)+ tan 10^(@). tan 35^(@)

Find the values of tan 9^@-tan 27^@-tan 63^@ + tan 81^@

Find the value of tan4^(@).tan43^(@).tan47^(@).tan86^(@) .

Find the value of tan 10^(@) + tan 35^(@) + tan 10^(@) . tan 35^(@)

Find the value of (tan 42^@ + tan 18^@)/(1-tan 42^@ tan 18^@)+ tan 300^@

If tan 28^(@)=n, " then find the value of " (tan152^(@)+tan62^(@))/(tan242^(@)+tan28^(@)) .