" find the value "d" tang" "-tan22^(@)-tan63^(@)+tan81

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

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

tan 22^@ - tan 68^@

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

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

Find the value of "tan" 22^(@) 30' .

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

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