[19.],[sin54^(@)+cos67^(@)=sin23^(@)+cos36^(@)]

cos54^(@)cos36^(@)-sin54^(@)sin36^(@)=0

sin36^(@)+cos36^(@)=sqrt(2)cos9^(@)

The expression (sin 22^(@)cos 8^(@)+cos 158^(@) cos 98^(@))/(sin 23^(@) cos 7^(@)+cos 157^(@) cos 97^(@)) when simplified reduces to

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

Evalute (f) (sin36^(@))/(cos54^(@))-(sin54^(@))/(cos36^(@))

The value of the determinant Delta=|{:(sin^(2)23^(@)" "sin^(2)67^(@)" "cos180^(@)),(-sin^(2)67^(@)" "-sin^(2)23^(@)" "-cos180^(@)),(cos180^(@)" "sin^(2)23^(@)" "sin^(2)67^(@)):}| is

Find the value of (sin25^(@))/(cos65^(@))+(tan23^(@))/(cot67^(@))

The value of (sin22^(@)cos8^(@)+cos158^(@)cos98^(@))/(sin23^(@)cos7^(@)+cos157^(@)cos97^(@))

The value of (sin22^(@)cos8^(@)+cos158^(@)cos98^(@))/(sin23^(@)cos7^(@)+cos157^(@)cos97^(@))