Let z = cos & sup2; X / y, then DZ =?

Let z = cos & sup2; X / y, then DZ =?

∂z/∂x=2cosx*(-sinx)/y=-sin2x/y
∂z/∂y=cos²x*(-1/y²)=-cos²x/y
So DZ = - sin2x / YDX cos & sup2; X / YDY
1/(3-√7)=(3+√7)/2
Four
There are three numbers, their greatest common divisor is 1, and their least common multiple is 105?
3,5,7
Cos (x * x + y * y), find DZ
Every step of the way
dz=-2x×sin（x*x+y*y）dx+（-2y×sin（x*x+y*y））dy
If you want to explain, you can chat with me directly. There are examples in the advanced mathematics book. Where is the multivariate differential
The greatest common divisor of two numbers is 1, and the least common multiple is 325. What are the two numbers
Two, please
25 and 13
13 and 25
Let f (x) = (2x + 5) 6, then the coefficient of X3 in F '(x) is______ .
F ′ (x) = 6 (2x + 5) 5 × 2 = 12 (2x + 5) 5 according to the binomial theorem, the term containing X3 is: 12 × C25 · (2x) 3 · 52 = 24000x3, so the answer is: 24000
Greatest common factor least common multiple
If a and B are two continuous natural numbers and a is a multiple of B, their greatest common factor is (), and their least common multiple is (). If a and B are two non-zero natural numbers and a is a multiple of B, their greatest common factor is (), and their least common multiple is ()
urgent
If a and B are two continuous natural numbers and a is a multiple of B, their greatest common factor is (1) and their least common multiple is (a * b). If a and B are two non-zero natural numbers and a is a multiple of B, their greatest common factor is (b) and their least common multiple is (a)
1,ab
B, a
1（1）2（ab）3（a）4（b）
1, ab
b, a
Given the derivative f '(x) = 2x-9 of the function f (x), and the value of F (0) is an integer, when x ∈ (n, N + 1) (n ∈ n *), there is only one value of F (x), then n = ()
A. 2B. 6C. 8D. 4
Let f be an integer x 2 (k) = 4.9k (x 2 + k) = 4.9k
The greatest common factor and the least common multiple of the fifth grade
To fill in 10 questions and 5 application questions, but also the answer
Common factors: 4 and 8,4 16 and 32,16 1 and 7,1 8 and 9,3 15 and 12,3 18 and 72,18 48 and 12,12 8 and 36,4 15 and 9,3 common multiple: 10 and 5,10 2 and 12,12 6 and 8,24 21 and 14,84 4 and 10,20 8 and 10,40 6 and 9,18 3 and 8,24 4 and 5,20 2 and 8,8 a square cloth
If f '(x) is the derivative of F (x) = (1 / 3) x2 + 2x + 1, then the value of F' (- 1) is
4/3
∵f'(x)=2/3x+2
∴f'(-1)=2/3*(-1)+2=4/3
Four Thirds 2 / 3x + 2: what?
Primary school mathematics. High score. Find the greatest common factor and the least common multiple
56 and 63 18 and 20 36 and 24 60 and 45 51 and 68 30, 15 and 20 only need the least common multiple
[56 and 63] 7 and 504
[18 and 20] 2 and 180
[36 and 24] 12 and 72
[60 and 45] 15 and 180
[51 and 68] 17 and 204
[30, 15 and 20] 60