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2 years ago

Rewrite with only sin x and cos x. cos 3x

Mathematics

1 answer:

Gekata [30.6K]2 years ago

6 0

$\cos (3x)=4\cos^3 x-3\cos x$

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In the triangle below, what is sin θ?

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Sin theta = 10/26 = 5/13

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What is 11:40 - 1 1/2

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Answer: 10:10

Step-by-step explanation:

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3 years ago

(−t 4 −5t 3 −10t 2 )+(9t 3 +3t 2 −1)

klemol [59]

Answer:

$\left(-t^4-5t^3-10t^2\right)+\left(9t^3+3t^2-1\right)=-t^4+4t^3-7t^2-1$

Step-by-step explanation:

Given the expression

$\left(-t^4\:-5t^3\:-10t^2\:\right)+\left(9t^3\:+3t^2\:-1\right)$

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$=-t^4-5t^3-10t^2+9t^3+3t^2-1$

Group like terms

$=-t^4-5t^3+9t^3-10t^2+3t^2-1$

Add similar elements

$=-t^4-5t^3+9t^3-7t^2-1$ ∵ $-10t^2+3t^2=-7t^2$

Add similar elements

$=-t^4+4t^3-7t^2-1$ ∵ $-5t^3+9t^3=4t^3$

Thus, the equivalent expression in simplified form:

$\left(-t^4-5t^3-10t^2\right)+\left(9t^3+3t^2-1\right)=-t^4+4t^3-7t^2-1$

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2 years ago

10 points please help and marked brainlyist

kherson [118]

Answer:

Sample 1 mean: 6.375

Sample 2 mean: 6.375

Sample 3 mean: 6.625

Range of sample means: 0.25

The first and last boxes should be checked, as they are true.

Step-by-step explanation:

To calculate the mean you must add all of the numbers together and then divide the sum by the quantity of numbers. Ex: 3+7+8+3+7+9+6+8 = 51.

51/8 = 6.375.

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1 year ago

What is the value of x?

Eduardwww [97]

Answer: 15

Step-by-step explanation:

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The x in the equation is 15

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2 years ago