If sin θ + cos θ = \(\sqrt {2 }\)cos θ, then value of cot θ is?
Answer & explanation
Correct answer: option 2
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