4 years ago

Are irrational numbers always/sometimes/never rational number?

Mathematics

1 answer:

gavmur [86]4 years ago

7 0

An irrational number can never be rational

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Step-by-step explanation:

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3 years ago

Given that cos(30°) = cos(45°)cos(15°) + sin(45°)sin(15°), it follows that cos(30°) =

mario62 [17]

Answer:

$cos(30\°) = cos(45\°-15\°)$

Step-by-step explanation:

To solve this problem you must know the formula of subtraction of angles for the function cosx.

The formula is:

$cos(h-d) = cos(h)cos(d) + sin(h)sin(d)$

We can write 30° as: 45° - 15°

Then:

$cos(30\°) = cos(45\°-15\°)$

Using the formula for subtraction of angles we have:

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Notice that we have achieved the expression shown in the statement

Finally:

$cos(30\°) = cos(45\°-15\°)$

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3 years ago

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The length of a rectangle is 7 inches and the width is (x+2) inches. Write an expression in simplest form that represents the ar

Sveta_85 [38]

7x + 14 is the expression that represents the area of this rectangle.

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3 years ago

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MArishka [77]

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3 years ago

<br> help please due in soon

Tamiku [17]

Answer:

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Step-by-step explanation:

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