Simplify: (sin θ − cos θ)2 − (sin θ + cos θ)2
−4sin(θ)cos(θ)
2
sin2 θ
cos2 θ

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture