SOLUTION: How do i complete the identity? sin(30)sin(50)cos(30)cos(50)=?

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Question 875408: How do i complete the identity?
sin(30)sin(50)cos(30)cos(50)=?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
sin(30°)sin(50°)cos(30°)cos(50°) =

sin(30°)cos(30°)·sin(50°)cos(50°) =

2%2F2sin(30°)cos(30°)·2%2F2sin(50°)cos(50°) =

1%2F2·2sin(30°)cos(30°)·1%2F2·2sin(50°)cos(50°) =

1%2F2·sin(60°)·1%2F2·sin(100°) =

1%2F4·sin(60°)·sin(100°)

1%2F4·sqrt%283%29%2F2·sin(100°)

sqrt%283%29%2F8·sin(100°)

Edwin