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svet-max [94.6K]
3 years ago
9

Prove this questionplease​

Mathematics
1 answer:
vovikov84 [41]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

Consider the left side

cos^{4}A + sin^{4}A - 2cos²Asin²A ← is the expansion of

= (cos²A - sin²A)²

Substitute sin²A = 1 - cos²A

= (cos²A - (1 - cos²A) )²

= (cos²A - 1 + cos²A)²

= (2cos²A - 1 )²

= right side , then proven

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Mark and peter went to an arcade where the machines took tokens. Marilk played 9 games of ping pong and 5 games of pinball, usin
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Answer:

9x + 5y = 29 ........... (1) and

3x + y = 7 ........... (2)

Each game of ping pong requires 1 number of token and each game of pinball requires 4 number of tokens.

Step-by-step explanation:

Let, each game of ping pong requires x number of tokens and each game of pinball requires y number of tokens.

So, from the given conditions we can write

9x + 5y = 29 ........... (1) and

3x + y = 7 ........... (2)

Now, solving equations (1) and (2) we get,

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Now, putting x = 1 in equation (2) we get,

3 + y = 7

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6 0
3 years ago
PLEASE HELP!!! URGENT!
Oksana_A [137]

Answer:

(D) p^{2} -9p+18

Step-by-step Explanation:

Assuming that the equation x^{2} -2 = p, we can convert the equation into this.

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Re-ordering the equation gets us:

p^{2} -9p+18

So, (D) p^{2} -9p+18 is equivalent to the original expression of (x^{2} -2)^{2} + 18 = 9x^{2} -18

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How do you do the pythagorean theoreom backwards?
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Answer:

I think it's called the  Converse of the Pythagorean. This tells us that if the square of one side of a triangle is equal to the sum of the squares of the other two sides, then the triangle is a right triangle.To do this you just plug in the numbers where c is the largest among a,b,c. ( in case you forgot a and b are bases and the c is called the hypotenuse)

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