`(cos 17^(@) + sin 17^(@))/(cos 17^(@) - sin 17^(@))=`

(cos17^(@)+sin17^(@))/(cos17^(@)-sin17^(@))=?

Convert the followng into products: (i) sin 53 ^(@) + sin 21 ^(@), (ii) cos 83^(@) - cos 17^(@), (iii) sin 50^(@)- cos 80^(@)

(sin19^(@))/(cos71^(@))+(cos73^(@))/(sin17^(@))

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

((sin49^(@))/(cos41^(@))-(cos17^(@))/(sin73^(@)))=?

(sin30^(@)17)/(cos59^(@)43)

sin47^(@)+cos77^(@)=cos17^(@)

(sin ^ (2) 63 ^ (@) + sin ^ (2) 27 ^ (@)) / (cos ^ (2) 17 ^ (@) + cos ^ (2) 73 ^ (@))

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)