[" 1.Value of "(tan69^(@)+tan66^(@))/(1-],[tan69^(@)tan66^(@))]

Prove that (tan69^(@)+tan66^(@))/(1-tan69^(@)tan66^(@))=-1

Prove that :(tan69^(@)+tan66^(@))/(1-tan69^(@)tan66^(@))=-1

Simplify be reducing to a single term : (tan 69^(@) + tan 66^(@))/(1 - tan 69^(@) tan 66 ^(@))

Prove that (i) "cos " 15^(@) - " sin " 15^(@) = (1)/(sqrt(2)) (ii) " cot " 105^(@) - " tan " 105^(@) =2sqrt(3) (iii) (tan 69^(@) + tan 66^(@))/(1-tan 69^(@) tan 66^(@)) =-1

Prove that :(tan69^@+tan 66^@)/(1-tan 69^@tan66^@)=-1

Prove that (tan69^@+tan66^@)/(1-tan69^@tan66^@)=-1 .

The value of (tan 47^(@) + tan 43^(@))/(1-tan 47^(@) tan 43^(@)) is

The value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) is