3 years ago

How many packages of pencils should Phillip buy?

Mathematics

1 answer:

AfilCa [17]3 years ago

3 0

C.........................

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mojhsa [17]

It is an acute angle.

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3 years ago

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Use Euler's formula to derive the identity. (Note that if a, b, c, d are real numbers, a + bi = c + di means that a = c and b =

storchak [24]

Answer with Step-by-step explanation:

We have to prove that

$sin 2\theta=2sin\theta cos\theta$ by using Euler's formula

Euler's formula : $e^{i\theta}=cos\theta+isin\theta$

$e^{i(2\theta)}=(e^{i\theta})^2$

By using Euler's identity, we get

$cos2\theta+isin2\theta=(cos\theta+isin\theta)^2$

$cos2\theta+isin2\theta=(cos^2\theta-sin^2\theta+2isin\theta cos\theta)$

$(a+b)^2=a^2+b^2+2ab, i^2=-1$

$cos2\theta+isin2\theta=cos2\theta+i(2sin\theta cos\theta)$

$cos2\theta=cos^2\theta-sin^2\theta$

Comparing imaginary part on both sides

Then, we get

$sin2\theta=2sin\theta cos\theta$

Hence, proved.

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4 years ago

The global surface water area is 361, 132,000 square metres. Calculate the volume of water needed to cause a 3mm in sea level.

vovangra [49]

Answer:

The volume of water is 396 cubic meter.

Step-by-step explanation:

Area of water, A = 132000 square meter

Height, h = 3 mm = 0.003 m

The volume of water is given by

V = Area x height

V = 132000 x 0.003

V = 396 cubic meter.

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3 years ago

How do I simplify 200:125

Dima020 [189]

Answer:

which class do u study? Pls tell me.

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3 years ago

Help now for Math!!!!!!!

Amiraneli [1.4K]

Answer:

x= 3/2y

Step-by-step explanation:

3y=2x

Step 1: Flip the equation.

2x=3y

Step 2: Divide both sides by 2.

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3 years ago