Answer:
The equation is exact
F(x,y) = 3x4/4 - 3xy -y2
Step-by-step explanation:
The step by step explanation and to ascertain the exactness of the differential equation is as shown in the attached file.
Given problem is 
To simplify that we need to multiply and divide by conjugate of the denominator
conjugate of denominator 6+i will be 6-i as we just need to change sign of the imaginary part
Now multiply and divide by 6-i







Hence final answer is 
105 - 75 = 30 That should do it.
<h3>
The volume of the cone is</h3><h2>
37.7</h2>
<u>The formula is:</u>
V= (3.14)π⋅ (radius)r^2⋅(height)h/3
(^2 is a exponent)
<u>How to solve:</u>
π ·2^2· 9/3= 37.69911
(Round to the nearest tenth)
<h3>
37.7</h3>