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[cos^(2)17^(@)+cos^(2)13^(@)],[" (ii) "s...

[cos^(2)17^(@)+cos^(2)13^(@)],[" (ii) "sin25^(@)cos65^(@)+cos25^(@)sin65^(@)]

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

2sin65^@cos25^@=

2 sin 25^(@) cos 15^(@)=

Evaluate: sin 25^(@) cos 65^(@) + cos 25^(@) sin 65^(@) .

cos 25^(@) - cos65^(@) =

Evaluate :- sin25^@cos65^@+cos25^@sin65^@ .

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

sin65^(@)+sin25^(@)=

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