If 0 ≤ θ ≤ (π / 2) and sec²θ +

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Using Rule 1,
sec²θ + tan²θ = 7
⇒ 1 + tan²θ + tan²θ = 7
⇒ 2 tan²θ = 7 – 1 = 6
⇒ tan²θ = 3
⇒ tan θ = √3
= tan 60°
⇒ θ = 60°
∵ 180° = π radian

∴ 60° =		π	× 60 =	π
		180		3

	5π	radian
	12