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  1. If sin θ + cos θ = √2 sin (90° – θ) then cot θ is equal to :
    1. 2
    2. 0
    3. 2 –1
    4. 2 + 1
Correct Option: D

sinθ + cosθ = √2 sin (90° – θ)
⇒ sinθ + cosq = √2 cosθ
⇒ √2 cosθ – cosθ = sinθ
⇒ cosθ (√2) - 1 = sinθ

cos θ
=
1
sin θ2 - 1

⇒ cot θ
1
×
2 + 1
2 - 12 + 1

=
2 + 1
= √2 + 1
2 - 1



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