Question

which of the following is not correct
a.sin theta= -1/5
b.cos theta= 1
c.sec theta=1/2
d.tan theta=20​

Answer 1

Answer:

C. sec θ = ½ Explanation: According to the question, We know that, a) sin θ = – 1/5 is correct since Sin θ ∈ [-1,1] b) cos θ = 1 is correct since Cos θ ∈ [-1,1] c) sec θ = ½ ⇒ (1/cos θ) = ½ ⇒cos θ=2 is incorrect since Cos θ ∈ [-1,1] d) tan θ = 20 is correct since tan θ ∈ R. Thus, option (C) sec θ = ½ is the correct answer