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Anarel [89]
2 years ago
13

Which will have a negative number?

Mathematics
1 answer:
lapo4ka [179]2 years ago
5 0

Answer:

B

Step-by-step explanation:

A: 27

C: 1

D: 2

B: -24

anytime you multiply two negative numbers it makes the product positive

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8 0
3 years ago
Solve sin theta + 1 = cos 2 theta on the interval 0 less than or equal to theta &lt;2 pi
hjlf

Answer:

Ф = 0 and Ф = π

Step-by-step explanation:

* Lets explain how to solve the problem

∵ sin Ф + 1 = cos²Ф, where 0 ≤ Ф < 2π

- To solve we must to replace cos²Ф by 1 - sin²Ф

∵ sin²Ф + cos²Ф = 1

- By subtracting sin²Ф from both sides

∴ cos²Ф = 1 - sin²Ф

- Lets replace cos²Ф in the equation above

∴ sin Ф + 1 = 1 - sin²Ф

- Subtract 1 from both sides

∴ sin Ф = - sin²Ф

- Add sin²Ф for both sides

∴ sin²Ф + sin Ф = 0

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∴ Ф = π

∵ 0 ≤ Ф < 2π

∵ Ф < 2π

∴ We will refused the answer Ф = 2π

∴ Ф = 0 and Ф = π

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