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andre [41]
3 years ago
5

30 times what equals 245

Mathematics
2 answers:
liberstina [14]3 years ago
4 0
Divide 245 by 30.
You should get 8.1666666666.....
KengaRu [80]3 years ago
3 0
30 * x = 245
lets divide 30 and 245, 245 / 30 = 8.167
8.167 x 30 = 245
hope it helped
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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:

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We can write 30° as: 45° - 15°

Then:

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Using the formula for subtraction of angles we have:

cos(45\°-15\°) = cos(45\°)cos(15\°) + sin(45\°)sin(15\°)

Notice that we have achieved the expression shown in the statement

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cos(30\°) = cos(45\°-15\°)

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