" (vii) "sqrt(3)cos13^(@)+sin13^(@)=2sin73^(@)

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

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

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

Evaluate the following: cos47^(0)cos13^(0)-sin47^(0)sin13^(@)

value of (5sin75^(@)sin77^(@)+2cos13^(@)cos15^(@))/(cos15^(@)sin77^(@))-(7sin81^(@))/(cos9^(@)) is

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

The values of cos^(2)73^(0)+cos^(2)47^(0)-sin^(2)43^(0)+sin^(2)107^(0) is equal to: ( b) (1)/(2)(c)(sqrt(3))/(2) (d) sin^(2)73^(@)+cos^(4)73^(@)