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Stella [2.4K]
3 years ago
12

1+cos(18x)=______ Please answer this

Mathematics
1 answer:
Komok [63]3 years ago
8 0

Answer with Explanation:

Keep in mind these trigonometric Identity:

1. Cos²x - Sin² x= Cos 2 x

2. Cos 2 x = 2 Cos²x-1

3. Cos 2 x = 1 - 2 Sin²x

Now, Coming to the Problem

1 + Cos (18 x)

= 1 + Cos (2 × 9 x)

= 2 Cos ² (9 x)→→→ Cos (2 × 9 x)= 2 Cos² (9 x) - 1

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kotykmax [81]

Answer:

916.57 pounds

Step-by-step explanation:

Cost of beef = 7.53 pounds × 9

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Total cost = 67.77 pounds + 58.05 pounds + 24.92 pounds

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4 0
3 years ago
What is the perimeter of a square which has the same area as a circle with circumference of 4π?
enot [183]

Answer:

perimeter = 8\sqrt{\pi }

Step-by-step explanation:

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A = πr² ← r is the radius

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s = \sqrt{4\pi } = 2\sqrt{\pi }, hence

perimeter = 4 × 2\sqrt{\pi } = 8\sqrt{\pi }



8 0
2 years ago
Will mark the brainliest
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Step-by-step explanation:

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3 years ago
A sewer line drops 1 foot every 40 feet. How many feet will it drop over a distance of 100 feet
kodGreya [7K]

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Step-by-step explanation:


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What is the Surface Area (SA) of a sphere that has a diameter of 4?
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