Q. `2sin11^@ 15'`is equal -

The value of sin^2 75^@-sin^2 15^@ is equal to:

The value of sqrt(2) (cos 15^@ - sin 15^@ ) is equal to

The value of cos 15^(@) - sin 15^(@) is equal to

The value of cos15^@-sin15^@ is equal to

The value of cos 15^(@) - sin 15^(@) is equal to .................. A) (1)/(sqrt2) B) (1)/(2) C) -(1)/(sqrt2) D) 0

The value of sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ . . . .+sin^(2)90^(@) 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-