Theorem# Limit of cosθ as θ → 0

As θ → 0, we have cosθ → 1

Proof :

When θ = 0, We have, lim\(_{θ\to 0} \cos \)θ = cos0 = 1   { ∵ cos0 = 1 }

Hence,

lim\(_{θ\to 0} \cos \)θ = 1