(cos13^(@)-sin13^(@))/(cos13^(@)+sin13^(@))+(1)/(cot148^(@))

If (cos13^(0)-sin13^(0))/(cos13^(0)+sin13^(0))+(1)/(cot148^(0))=k, then (k^(2))/(16) is equal to "

Prove that:(i) "tan"69^(@)+"tan"66^(@)+1="tan"69^(@) "tan"66^(@) (ii) (cos13^(@)+"sin"13^(@))/(cos13^(@)-"sin"13^(@))="tan"58^(@)

" The value of ((sin17^(@))(cos13^(@))+(cos17^(@))(sin13^(@)))/((cos23^(@))(cos37^(@))-(sin157^(@))(sin37^(@))) is equal to

If ( cos 13^(@)+sin13^(@))/(cos13^(@)-sin13^(@))=tan A , then A=_________

Prove that : (cos13^@+sin13^@)/(cos13^@-sin13^@) =tan 58^@ .

Evaluate: ((sin 77^(@))/(cos 13^(@)))^(2)+((cos 77^(@))/(sin 13^(@)))^(2)-2cos^(2)45^(@)

sin ^(-1) (3)/(5)+cos ^(-1) (12)/(13)=