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Lyrx [107]
3 years ago
12

What is –1 2/3•(-5 1/4)

Mathematics
1 answer:
Vesna [10]3 years ago
3 0

Answer:

17

Step-by-step explanation:

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Which of the following is not equal to cos⁡(520°)?
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The cosine repeats itself every 360 degrees, and it mirrors at 0 and 180 degrees. It inverts around 90 and 270.
So without using a calculator, you can tell that:

cos(520)=cos(520-360)=cos(160)
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cos(160) is NOT equal to cos(20), it would be -cos(20).
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