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OpenStudy (anonymous):
The derivative of f(x,y) at (1,-8) in the direction 1/sqrt50<-1,-7> is 1 and the derivative of f(x,y) at the point (1,-8) in the direction 1/sqrt34<5,-3> is 8. What is the derivative of f(x,y) at the point (1,-8) in the direction 1/sqrt65<1,8>.
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