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nika2105 [10]
3 years ago
15

[Number Theory, 3 Points]

Mathematics
1 answer:
scoray [572]3 years ago
4 0

Answer: 17

Step-by-step explanation:

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2 years ago
HELP FAST PLEASE!!!!!
lidiya [134]

Alright, lets get started.

The answer Sandra got is correct that is zero but there are some mistakes she made while writing steps.

2 cot(\frac{-9\pi}{2})  =  2 cot(\frac{9\pi}{2}) Incorrect step

Because as per even/odd identity,

Cot (-Θ) = - cot (Θ)

Hence

2 cot (\frac{-9\pi}{2}) = - 2 cot (\frac{9\pi}{2})

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It could be written as

-2 cot (\frac{9\pi}{2}) =   -2 cot (\frac{\pi}{2})


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0

Hence the answer is 0. : Answer

Hope it will help :)

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3 years ago
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