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3 years ago

Find the correct value to fill in the space below. cos 50° = 2 cos^2 ____° -1

Mathematics

2 answers:

stepladder [879]3 years ago

8 0

Answer:

25°

Step-by-step explanation:

Using the double angle trigonometric identity for cosine

• cos2x = 2cos²x - 1

Here 2x = 50° ⇒ x = 25°, thus

cos50° = 2cos²25° - 1

yanalaym [24]3 years ago

3 0

Answer:

25.

Step-by-step explanation:

Use the identity cos 2x = 2 cos^2 x - 1

So cos 50 = 2 cos^2 25 - 1

So the space = 25.

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photoshop1234 [79]

Answer:

The Ration of length 2.0 meters to the length 1.2 meters = 5 : 3

Step-by-step explanation:

The given two length are 2.0 m and 1.2 m

Length L1 = 2.0 m And

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SO, The ratio of L1 : L2 = $\frac{2.0}{1.2}$

Or, The ratio of L1 : L2 = $\frac{20}{12}$

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4 years ago

Find the value of x in the picture

andrew11 [14]

Answer:

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Step-by-step explanation:

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3 years ago

You are making a welding fixture and must cut down a length of copper tubbing from 15 1/8 inches to 8 3/4 inches. If the leftove

Bumek [7]

Answer: $6\dfrac{3}{8}\text{ inches}$

Step-by-step explanation:

Given: Original length = $15\dfrac{1}{8}$ inches

$=\dfrac{8\times15+1}{8}=\dfrac{121}{8}$ inches ( In improper fraction )

Length of piece cut from original = $8\dfrac{3}{4}$ inches

$=\dfrac{4\times8+3}{4}$ $= \dfrac{35}{4}$ inches ( In improper fraction )

Length of piece leftover piece = (Original length ) - (Length of piece cut )

$=\dfrac{121}{8}-\dfrac{35}{4}\\\\=\dfrac{121-2\times35}{8}\\\\=\dfrac{121-70}{8}\\\\=\dfrac{51}{8}\\\\=6\dfrac{3}{8}\text{ inches}$

Hence, the leftover piece will be $6\dfrac{3}{8}\text{ inches}$ long.

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4 years ago

harina [27]

Answer: C) [-1,-3,-7,-19]

Step-by-step explanation:

Range = {-2(-2) - 5, -2(-1) - 5, -2(1) - 5, -2(2) - 5} = {4 - 5, 2 - 5, -2 - 5, -4 - 5} = (-1, -3, -7, -9}

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3 years ago

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712/34 divide it then you have your answer :)

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4 years ago