Use the squared identities to simplify 2sin^2xsin^2x

Find the values of y: 3y^3(y^2+ 2/3y)=0

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Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?