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kaiz122Best ResponseYou've already chosen the best response.0
\[f(x,y)= \sin(xy)\] at \[2,\frac{\pi}{4}\]
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
do you mean f(x)=sinx. f(y)=siny
 one year ago

kaiz122Best ResponseYou've already chosen the best response.0
no, f(x,y)= sin(xy) Find \[d_{\theta}f(2, \frac{\pi}{4})\]
 one year ago

terenzreignzBest ResponseYou've already chosen the best response.0
Okay, easiest way to do this is with gradients.
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
oh looks like composite function.
 one year ago

kaiz122Best ResponseYou've already chosen the best response.0
my answer is 0. is this right?
 one year ago

terenzreignzBest ResponseYou've already chosen the best response.0
Sorry, was preoccupied. The directional derivative of a function in the direction of the vector v is given by this formula: \[\large \nabla f(x,y) \cdot \frac{v}{v}\]
 one year ago

terenzreignzBest ResponseYou've already chosen the best response.0
So, first, you need to get the unit vector of \[<2, \frac{\pi}{4}>\]
 one year ago
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