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Kruka [31]
3 years ago
6

sin%28%20%5Calpha%20%29%20" id="TexFormula1" title=" \cos( \alpha + \frac{\pi}{2} ) = - \sin( \alpha ) " alt=" \cos( \alpha + \frac{\pi}{2} ) = - \sin( \alpha ) " align="absmiddle" class="latex-formula">
why is it equal​
Mathematics
1 answer:
alexandr1967 [171]3 years ago
5 0

\cos (\alpha +\frac{\pi}{2})= \cos(\frac{\pi}{2})\cos (\alpha)- \sin(\frac{\pi}{2})\sin(\alpha)\\=0-\sin(\alpha)\\=-\sin (\alpha)

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Analyze the reflectional symmetry of the partial circle.
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Find the circumference of a circle that has a radius of 3 in. (Include the unit of measure.)
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C = 18.85
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NO LINK SPAM OR REPORT: Tell whether x and y show direct variation. Explain your reasoning. If so, find k.
sergeinik [125]

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2. yes; the equation can be written as y = kx; k = 1

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3 0
2 years ago
Which of the following shows one way to simplify 43Σn=1(3+9n)?
kramer

Based on the given summation notation, the expression that shows one way to simplify 43 Σ n=1 (3+9n) is (a) 43 Σ n=1 3 + 43 Σ n=1 9n

<h3>How to determine the summation expression?</h3>

The expression is given as:

43Σn=1(3+9n)

As a general rule, if a summation notation is represented using the following expression

Σ(a + bn)

The equivalent expression of the above summation notation is

Σa + bn

Where the variable a is a constant in the expression

This means that:

Σ(a + bn) = Σa + bn

Using the above equation as a guide, we have the following equivalent equation

43 Σ n=1 (3+9n) = 43 Σ n=1 3 + 43 Σ n=1 9n

Hence, based on the given summation notation; the expression that shows one way to simplify 43 Σ n=1 (3+9n) is (a) 43 Σ n=1 3 + 43 Σ n=1 9n

Read more about summation notation at:

brainly.com/question/16599038

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6 0
2 years ago
Answer the questions
Flauer [41]
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12) l = 55cm ; w = 40cm ; h = 30 cm
volume = 55cm * 40cm * 30cm = 66,000 cm³

7 0
3 years ago
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