Find the directional derivative of f(x, y)=x2y3+2x4y at the point (1,5) in the direction θ=π/3. the gradient of f is:

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

The monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2