Two vectors, r and s, lie in the x-y plane. Their magnitudes are 23.2 and 39.8 units, respectively, and their polar angle directions (as measured counterclockwise from the positive x axis) are 241.4° and 69.7°, respectively. What is the value of the scalar product (i.e. dot product) of r and s? a) -916 b)925 c) -458 d) 166 e) -1830

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