`cos2 0^(@)+2sin^2 5 5^(@)-sqrt(2)sin6 5^(@)` is equal to

The value of (cos ^(6)5^(@)-15 cos ^(4) 5^(@) sin ^(2)5^(@)+15 cos ^(2)5^(@)sin ^(4) 5^(@)-sin ^(6)5^(@)) is equal to-

sin^(2)17.5^(@) +sin^(2)72.5^(@) is equal to:

sin^(2)17.5^(@) + sin^(2)72.5^(@) is equal to

sin^(2)17.5^(@)+sin^(2)72.5^(@) is equal to

cos^(2)(97.5^(@))-sin^(2)(37.5^(@)) is equal to-

sin x+cos x=sqrt(2)sin5x

sin^2 17.5^@+sin^2 72.5^@ is equal to

sin^2 17. 5^(@)+sin^2 72. 5^(@) is equal to............ A) cos ^(2) 90^(@) B) tan ^(2) 45^(@) C) cos ^(2) 30^(@) D) sin ^(2) 45^(@)

If cos18^(@)-sin18^(@)=sqrt(2)sinA . Then value of tan5A+cot5A+sin5A+cos5A is :

cos ^(2) 48^(@) - sin ^(2) 12 ^(@) = (sqrt5+1)/(8).