If tan 45° = cotθ, then the value of θ, in

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tan 45° = cotθ
⇒ tan 45° = tan (90° – θ)
⇒ 45° = 90° – θ
⇒ θ = 90° – 45° = 45°
∵ 180° = π radian

∴ 45° =	π	× 45°
	180

=	π	radian
	4