[" (1) "(sin^(2)63^(@)+sin^(2)27^(@))/(cos^(2)17^(@)+cos^(2)73^(@))],[" (ii) "sin25^(@)cos65^(@)+cos25^(@).sin65^(@)]

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

Evaluate : sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

2sin65^@cos25^@=

Evaluate: (i) (sin^2 63^@+sin^2 27^@)/(cos^2 17^@+cos^2 73^@) (ii) sin 25^@ cos 65^@+cos 25^@sin 65^@

Prove that ((sin^(2)73^(@)+sin^(2)17^(@)))/((cos^(2)28^(@)+cos^(2)62^(@)))=1.

Evaluate :- (sin^2 63^@+sin^2 27^@)/(cos^2 17^@+cos^2 73^@) .

The value of [ ( sin^(2) 25^(@) + sin^(2) 65^(@))/(cos^(2) 24^(@) + cos^2 66^(@)) + sin^(2)61^(@) + cos 61^@ sin 29^(@)] is :

sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)