[" 28) "(cos9^(2)+sin9^(@))/(cos9^(@)-sin9^(@))=],[[" 1)tan "26^(@)," 2)tan "81^(@)," 3)tan "54^(@)," 4)tan "18^(@)]]

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=tan54^(@)

Prove : (cos 9^(@) +sin9^(@))/(cos9^(@) - sin9^(@)) = tan54^(@)

Prove that (cos 9^(@)+ sin 9^(@))/(cos 9^(@) -sin 9^(@)) = tan 54^(@)

Prove that (cos 9^(@)+ sin 9^(@))/(cos 9^(@) -sin 9^(@)) = tan 54^(@)

sin9^(@)+cos9^(@)=sqrt(2)sin54^(@)

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=(a)tan54^(@)(b)tan36^(@)(d) None of these (c)tan18^(@)

Prove that (cos9^@+sin9^@)/(cos9^@-sin9^@)=tan54^@

Prove that tan54^@=(cos9^@+sin9^@)/(cos9^@-sin9^@)

A =(cos 9^(@) - sin 9^(@))/(cos 9^(@) + sin 9^(@)) , B = (cos 21^(@) + sin 21^(@))/(cos21^(@) -sin21^(@)) and C= tan 20^(@) + tan40^(@) + sqrt(3)tan20^(@) tan40^(@) then descending order is:

A=(cos9^(@)-sin9^(@))/(cos9^(@)+sin 9^(@)), B=(cos21^(@)+sin21^(@))/(cos21^(@)-sin21^(@)) and C=tan 20^(@)+tan 40^(@)+sqrt(3)tan20^(@)tan40^(@) then descending order is