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Lostsunrise [7]
1 year ago
10

Math question (2 QUESTIONS!!)

Mathematics
1 answer:
lesantik [10]1 year ago
6 0

Answer: |-14.6-(-5.2)|

|-12-(-1)| ==> 4th option

Step-by-step explanation:

In order to find the distance between two points, you have to subtract one point from another and take the absolute value of the difference.

|-14.6-(-5.2)|=

|-14.6+5.2|=

|-9.4|=9.4

|-14.6-(-5.2)| ==> |-12-(-1)| ==> 4th option

|-12+1|=

|-11|=11

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Answer: sin\frac{a}{2} = ± \frac{1}{\sqrt{26} }

Step-by-step explanation:

We very well know that,

cos2A=1−2sin²A

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As required,  set A = \frac{a}{2}   &   cos a=  \frac{12}{13}    ,thus we get

sin \frac{a}{2} =± \sqrt{\frac{1-cos a}{2} }  

∴ sin\frac{a}{2} =±\sqrt{\frac{1-\frac{12}{13} }{2} } = ± \frac{1}{\sqrt{26} }

   since ,360° < \frac{a}{2} <450°

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Now, we are to select the value with the correct sign. It's is obvious from the above constraints that the angle a/2 lies in the III-quadrant where 'sine' has negative value, thus the required value is negative.

hope it helped!

   

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Step-by-step explanation:

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Step-by-step explanation:

4.

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