Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Solve : cos θ + sin θ = cos 2 θ + sin 2 θ .
Text Solution
Verified by ExpertsThe correct answer is:
2
2 n π , n ∈ Ι or 
+ 
, n ∈ Ι
cos θ + sin θ = cos 2 θ + sin 2 θ
or cos θ – cos 2 θ = sin 2 θ – sin θ
or 2 sin 
sin 
= 2 sin 
cos 
⇒ sin 
= 0 or sin 
= cos 
⇒ θ = 2n π or θ = 
+ 
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