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Which equation can be used to solve for [tex]b[/tex]?

A. [tex]b = 8 \tan (30^\circ)[/tex]
B. [tex]b = \frac{8}{\tan (30^\circ)}[/tex]
C. [tex]b = 8 \sin (30^\circ)[/tex]
D. [tex]b = 6 - \frac{8}{\sin (30^\circ)}[/tex]


Sagot :

To determine which equation can be used to solve for [tex]\( b \)[/tex], let's evaluate each of the given options. We know some important trigonometric values for a [tex]\(30^\circ\)[/tex] angle:

1. [tex]\(\sin(30^\circ) = \frac{1}{2}\)[/tex]
2. [tex]\(\tan(30^\circ) = \frac{1}{\sqrt{3}}\)[/tex]

Now let's plug these values into each equation to find the corresponding value of [tex]\( b \)[/tex]:

1. Option 1: [tex]\( b = 8 \tan(30^\circ) \)[/tex]
[tex]\[ \tan(30^\circ) = \frac{1}{\sqrt{3}} \][/tex]
[tex]\[ b = 8 \times \frac{1}{\sqrt{3}} \approx 4.6188 \][/tex]

2. Option 2: [tex]\( b = \frac{8}{\tan(30^\circ)} \)[/tex]
[tex]\[ \tan(30^\circ) = \frac{1}{\sqrt{3}} \][/tex]
[tex]\[ b = \frac{8}{\frac{1}{\sqrt{3}}} = 8 \sqrt{3} \approx 13.8564 \][/tex]

3. Option 3: [tex]\( b = 8 \sin(30^\circ) \)[/tex]
[tex]\[ \sin(30^\circ) = \frac{1}{2} \][/tex]
[tex]\[ b = 8 \times \frac{1}{2} = 4 \][/tex]

4. Option 4: [tex]\( b = 6 - \frac{8}{\sin(30^\circ)} \)[/tex]
[tex]\[ \sin(30^\circ) = \frac{1}{2} \][/tex]
[tex]\[ b = 6 - \frac{8}{\frac{1}{2}} = 6 - 16 = -10 \][/tex]

From our calculations, the results for each option are as follows:

1. [tex]\( b \approx 4.6188 \)[/tex]
2. [tex]\( b \approx 13.8564 \)[/tex]
3. [tex]\( b = 4 \)[/tex]
4. [tex]\( b = -10 \)[/tex]

Thus, these are the values corresponding to each equation:

- [tex]\( b = 8 \tan(30^\circ) \approx 4.6188 \)[/tex]
- [tex]\( b = \frac{8}{\tan(30^\circ)} \approx 13.8564 \)[/tex]
- [tex]\( b = 8 \sin(30^\circ) = 4 \)[/tex]
- [tex]\( b = 6 - \frac{8}{\sin(30^\circ)} = -10 \)[/tex]

So, depending on the specific value needed for [tex]\( b \)[/tex], any of these equations could theoretically be used. However, each equation solves for a different value of [tex]\( b \)[/tex].