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Fed [463]
3 years ago
5

Which decimal number is equal to 4/9 ?

Mathematics
2 answers:
mash [69]3 years ago
5 0
The decimal that is equal to 4/9 is 0.44444?
Fittoniya [83]3 years ago
5 0
0.(4). the 4 after the decimal is infinite. Divide four by nine, what do you get? 0.444444444444444444444444444 etc.
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(the relation you wrote is not correct, there may be something missing, so I will simplify the initial expression)

Here we have the equation:

sin^4(x) + cos^4(x)

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Now we can add and subtract cos^2(x)*sin^2(x) to get:

(sin^2(x))^2 + (cos^2(x))^2 + 2*cos^2(x)*sin^2(x) - 2*cos^2(x)*sin^2(x)

We can complete squares to get:

(cos^2(x) + sin^2(x))^2 - 2*cos(x)^2*sin(x)^2

and we know that:

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then:

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This is the closest expression to what you wrote.

We also know that:

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If we replace that, we get:

1 - \frac{sin^2(2*x)}{2}

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Off topic Btw it reminds me of area = length * width/height

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