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Vesna [10]
2 years ago
6

Need help with this problem. ​

Mathematics
1 answer:
tigry1 [53]2 years ago
5 0

Answer:

C) -\frac{47}{49}

Step-by-step explanation:

By the cos double angle formula, we know \cos(2\theta)=2\cos^2\theta-1. Substituting \cos \theta into the formula, we get

\cos(2\theta)=2(-\frac{1}{7})^2-1\\~~~~~~~~~~=\frac{2}{49}-1\\~~~~~~~~~~=\boxed{-\frac{47}{49}}.

The answer is C.

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rodikova [14]
There is a not so well-known theorem that solves this problem.

The theorem is stated as follows:
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This means that for a triangle ABC, where angle A has a bisector AD such that D is on the side BC, then 
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Here either
BD/DC=6/5=AB/AC, where  AB=6.9,  
then we solve for  AC=AB*5/6=5.75,

or

BD/DC=6/5=AB/AC, where  AC=6.9,  
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Hence, the longest and shortest possible lengths of the third side are
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4 0
3 years ago
Read 2 more answers
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Answer:

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Step-by-step explanation:

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4 0
2 years ago
A. angleFJG = angleHJG by SAS<br> PLEASE HELP
Vlada [557]

Answer:

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3 0
3 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
Help asap marking as BRAINLIST ace only
Soloha48 [4]

Answer:

O: The circle's name is "O"

Step-by-step explanation:

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