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bazaltina [42]
3 years ago
5

How do I know the following equation is true:

Mathematics
1 answer:
Veseljchak [2.6K]3 years ago
4 0

Answer:

The equation is true

Step-by-step explanation:

The best way to check if this equate is true is to convert the pi in radians to degree and actually evaluate the trigonometric terms.

Mathematically we know that pi = 180 degrees

So pi/8 = 22.5

and pi/4 = 180/4 = 45

So let’s make our check.

Insert pi = 22.5 and pi = 45

So we have;

tan 22/5 = √(1-cos45)/(1+cos45)

Now let’s evaluate this using a calculator.

tan 22/5 = 0.414213562373

The term in the root; 0.171572875254

The square root of this number is 0.414213562373

This is exactly as what is obtained with the tan 22.5

So we conclude that what we have is true

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(5ab-9a-4) - (-4ab + 5)
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Answer:

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Step-by-step explanation:

first, we can distribute the negative sign to the second set of parentheses.

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now let's put the values in (5ab-9a-4) side by side with the corresponding values in + 4ab - 5

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= 9ab - 9a - 9, because 5ab + 4ab = 9ab, -9a is alone, and -4 - 5 = -9.

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3 years ago
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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4 0
3 years ago
Round the mixed number to the nearest whole or half. 11 5/6
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