The integers are 9 and 10. 9 + 10 = 19. 19^2 = 361
The first and the difficult thing is you need to tell that
x^2-4xy+4y^2 = ( x - 2y )^2
so from question you know 3x - 6y = x - 2y = 9z
finial : ( x - 2y )^2 = ( 9z )^2=81z^2
so the answer is D . Hope this would help you .
Answer:
The answer should be: B. (9,3)
Answer:
Each time you subtract one less then before
Step-by-step explanation:
I know this because from 830 to 823 they subtracted by 7 and then from 823 to 817 they subtracted by 6 so it keep going down the line.
Step-by-step explanation:
We must prove that
cos²a(csc²a-cot²a) = cos²a
If we look at both sides, we can see that we have cos²a * something = cos²a. Therefore, if we can get that something to equal 1, we have our proof. In this case, that something is csc²a-cot²a. Using this information, we can work from within the parenthesis and go from there.
We can start by expanding the items in the parenthesis. Taking that csc(x) = 1/sin(x) and cot(a) = cos(x)/sin(x), we can say that
cos²a(csc²a-cot²a) = cos²a(1/sin²a - cos²a/sin²a). Because both items in the parenthesis have a denominator of sin²a, we can subtract cos²a from 1 to get
cos²a(1/sin²a - cos²a/sin²a)= cos²a((1-cos²a)/sin²a))
Next, we know that cos²a+sin²a=1, so 1-cos²a = sin²a. Plugging that in, we get
cos²a((1-cos²a)/sin²a)) = cos²a(sin²a/sin²a)
= cos²a(1)
= cos²a
