Find the directional derivative of a multivariable function in under one minute

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#shorts #multivariable_calculus #calculus_3 #directional_derivative #gradient #normalize #vector #vector_calculus #math
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Mate there is a calculation error in the last step. The answer is -5/ root 10

harshyadav-yearb.tech.che
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So, in this case, for the function f(x, y) the directional derivative is the rate of change towards Q from P? In other words, it is the gradient at point P in the direction of Q?

slothbearanonymous