Given [tex]\sin \left(30^{\circ}\right)=\frac{1}{2}[/tex] and [tex]\cos \left(30^{\circ}\right)=\frac{\sqrt{3}}{2}[/tex], use trigonometric identities to find the value of [tex]\cot \left(30^{\circ}\right)[/tex].

A. [tex]\frac{1}{2}[/tex]
B. [tex]\frac{\sqrt{3}}{3}[/tex]
C. [tex]\frac{\sqrt{3}}{2}[/tex]



Answer :

To find the value of [tex]\(\cot(30^{\circ})\)[/tex] given that [tex]\(\sin(30^{\circ}) = \frac{1}{2}\)[/tex] and [tex]\(\cos(30^{\circ}) = \frac{\sqrt{3}}{2}\)[/tex], we can use the trigonometric identity for cotangent:

[tex]\[ \cot(x) = \frac{\cos(x)}{\sin(x)} \][/tex]

Let's apply this identity to [tex]\(30^{\circ}\)[/tex]:

1. Write the cotangent identity:
[tex]\[ \cot(30^{\circ}) = \frac{\cos(30^{\circ})}{\sin(30^{\circ})} \][/tex]

2. Substitute the known values of [tex]\(\sin(30^{\circ})\)[/tex] and [tex]\(\cos(30^{\circ})\)[/tex]:
[tex]\[ \cot(30^{\circ}) = \frac{\frac{\sqrt{3}}{2}}{\frac{1}{2}} \][/tex]

3. Simplify the fraction:
[tex]\[ \cot(30^{\circ}) = \frac{\sqrt{3}/2}{1/2} = \sqrt{3} \][/tex]

Therefore, the value of [tex]\(\cot(30^{\circ})\)[/tex] is:

[tex]\[ \cot(30^{\circ}) = \sqrt{3} \][/tex]

Given the provided options are:

[tex]\[ \frac{1}{2} \][/tex]

[tex]\[ \frac{\sqrt{3}}{3} \][/tex]

[tex]\[ \frac{\sqrt{3}}{2} \][/tex]

None of these correspond directly to [tex]\(\sqrt{3}\)[/tex]. Considering only the integer part of [tex]\(\sqrt{3}\approx 1.732\)[/tex] among the options:

[tex]\(\cot(30^{\circ})\)[/tex] simplifies exactly to one of the provided options. In this context, the closest integer match calculating it precisely is [tex]\(\approx 1.7320508075688772\)[/tex]. Therefore, none matches strictly with specific option list.

The cotangent value determined demonstrates the closest precise value indeed provided is :

[tex]\(\boxed{\sqrt{3}}.\)[/tex]

Given exact numerical understanding:

The value correctly matched is indeed approximating [tex]\(1.7320508075688772\)[/tex].