sec θ is defined as:
A1/sin θ
Bsin θ/cos θ
C1/tan θ
D1/cos θ
Answer & Solution
Correct answer: D. 1/cos θ
sec θ = 1/cos θ (cosecant: csc θ = 1/sin θ; cotangent: cot θ = 1/tan θ).
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