3 years ago

Please help with this question: Choose 1 answer: A=Positive B= negative C=zero

Mathematics

1 answer:

nadezda [96]3 years ago

3 0

Answer:

$B= negative$

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Rewrite <br><img src="https://tex.z-dn.net/?f=%20%7Bcos%7D%5E%7B4%7D%20x" id="TexFormula1" title=" {cos}^{4} x" alt=" {cos}^{4}

erastovalidia [21]

All you need is the double angle identity:

$\cos^2x=\dfrac{1+\cos2x}2$

So we have

$\cos^4x=(\cos^2x)^2=\left(\dfrac{1+\cos2x}2\right)^2=\dfrac{1+2\cos2x+\cos^22x}4$

Apply the identity again to the squared term:

$\cos^4x=\dfrac{1+2\cos2x+\frac{1+\cos4x}2}4=\dfrac{3+4\cos2x+\cos4x}8$

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3 years ago

11. The length (L) of a rectangular picture frame

zvonat [6]

I’m having same problem

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3 years ago

Solve to find x and y in the diagram. HELP PLEASE!!!

Mashcka [7]

6x = 90

x = 90/6

x = 15

4x + 10y = 90

4(15) + 10y = 90

60 + 10y = 90

10y = 30

y = 3

Answer: Last option

x = 15, y = 3

3 0

3 years ago

Read 2 more answers

Pls pls pls answer quick

antoniya [11.8K]

Answer:

5x+3=3x+15

Subtract 3 from both sides

5x=3x+12

Subtract 3x from both sides

2x=12

Divide both sides by 2

Step-by-step explanation:

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3 years ago

The area of a rectangular field is 5695 m².

denpristay [2]

Answer:

85 m

Step-by-step explanation:

5696/67=85

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3 years ago