Question

pls someone answer this plsssss​

Answer 1

Answer:

Option 4). 60°

ExplanaTion:

CotØ = 1/√3

→ Cot60 = 1/√3

You've to learn the numeric values from the following table:

$\Large{ \begin{tabular}{|c|c|c|c|c|c|} \cline{1-6} \theta & \sf 0^{\circ} & \sf 30^{\circ} & \sf 45^{\circ} & \sf 65^{\circ} & \sf 90^{\circ} \\ \cline{1-6} \sin & 0 & \dfrac{1}{2 } & \dfrac{1}{ \sqrt{2} } & \dfrac{ \sqrt{3}}{2} & 1 \\ \cline{1-6} \cos & 1 & \dfrac{ \sqrt{ 3 }}{2} } & \dfrac{1}{ \sqrt{2} } & \dfrac{ 1 }{ 2 } & 0 \\ \cline{1-6} \tan & 0 & \dfrac{1}{ \sqrt{3} } & 1 & \sqrt{3} & \infty \\ \cline{1-6} \cot & \infty & \sqrt{3} & 1 & \dfrac{1}{ \sqrt{3} } &0 \\ \cline{1 - 6} \sec & 1 & \dfrac{2}{ \sqrt{3}} & \sqrt{2} & 2 & \infty \\ \cline{1-6} \csc & \infty & 2 & \sqrt{2 } & \dfrac{ 2 }{ \sqrt{ 3 } } & 1 \\ \cline{1 - 6}\end{tabular}}$

Some extra things to remember while solving trignometrical questions:

• Sin²Ø + Cos²Ø = 1
• Sec²Ø - Tan²Ø = 1
• Cosec²Ø - Cot²Ø = 1
• SinØ = 1/CosecØ
• CosecØ = 1/CosecØ
• TanØ = 1/CotØ
• CotØ = 1/TanØ
• SecØ = 1/CosØ
• CosØ = 1/SecØ

Answer 2

Answer:

$\cot(60) = \frac{1}{ \sqrt{3} }$

ANSWER WILL BE OPTION D =60°.