Which of the following is not equal to sec θ?

Question

Which of the following is not equal to sec θ?

A) csc (90 - θ)

B) sec (-θ)

C) -tan θ

D)√1+tan^2 θ

Answer 1

√Which of the following is not equal to sec θ?

A) csc (90 - θ) = 1/sin(90 - θ) = 1/cos θ = sec θ

B) sec (-θ) = sec θ

C) -tan θ ≠ sec θ

D)√1+tan^2 θ = √sec² θ = sec θ

Answer: (C) -tan θ is not equal to sec θ