allerycos²θ + sin²θ is equal to:
A0
Btan²θ
C2
D1
Answer & Solution
Correct answer: D. 1
1. The fundamental Pythagorean identity: cos²θ + sin²θ = 1 for all θ.
2. Two consequences: 1 + tan²θ = sec²θ and 1 + cot²θ = cosec²θ.
3. Holds for any real angle, in radians or degrees.
_Source: syllabus Maths Ch 3 §3.3 Pythagorean Identity_
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