4 years ago

Wayne gretzky holds the nhl records for the most points scored in a career. he scored 2857 points in 1487 games

Mathematics

1 answer:

Verizon [17]4 years ago

3 0

I know some of the language and some of then I do not know

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Which expression is equivalent to 2cos^2(x/2)- cos(x)?<br> Edge 2020

olchik [2.2K]

Given:

The expression is

$2\cos^2(\dfrac{x}{2})-\cos (x)$

To find:

The expression which is equivalent to the given expression.

Solution:

We have,

$2\cos^2(\dfrac{x}{2})-\cos (x)$

We know that,

$\cos x=2\cos^2 (\dfrac{x}{2})-1$

Using this formula, the given expression can be written as

$2\cos^2(\dfrac{x}{2})-\left(2\cos^2(\dfrac{x}{2})-1\right)$

$=2\cos^2(\dfrac{x}{2})-2\cos^2(\dfrac{x}{2})+1$

$=1$

Therefore, the given expression is equivalent to 1.

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prohojiy [21]

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I need help with arithmetic and geometric sequences

Drupady [299]

So basically an arithmetic sequence has a common difference, a number which is either added or subtracted at a constant rate (only that number). A geometric sequence is the ratio between two numbers, meaning they are either multiplied or divided by the same number. The sequence would be neither if it follows none of these patterns. So by this logic:

14. Arithmetic, 15. Geometric, 16. Neither, 17. Geometric

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3 years ago

What term describes a poll often used to find the opinions of a group of people?

KengaRu [80]

I would go with

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Because it's a great way to get the opinions of a lot of people

Hope that helps :)

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