Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If sin θ + cos θ = \(\sqrt {2 }\)cos θ, then value of cot θ is?

Options:

\(\sqrt {2 }\) - 1

\(\sqrt {2 }\) + 1

1

\(\sqrt {2 }\)

Correct Answer:

\(\sqrt {2 }\) + 1

Explanation:

sin θ + cos θ = \(\sqrt {2 }\)cos θ

divide by cos θ

⇒ tan θ + 1 = \(\sqrt {2 }\)

⇒ tan θ = \(\sqrt {2 }\) - 1

⇒ cot θ = \(\frac{1}{\sqrt {2 } - 1}\)

            = \(\frac{1}{\sqrt {2 } - 1}\) × \(\frac{\sqrt {2 } + 1}{\sqrt {2 } + 1}\)

            = \(\sqrt {2 }\) + 1