Question

Which of the following is not correct? * 1 sin⁡θ=-1/3
cos⁡θ=0.5
tan⁡θ=30
sec⁡θ=1/2​

Answer 1

Answer:

sec(theta) = 1/2

Step-by-step explanation:

sec(theta) never lies between -1 and 1.

Answer 2

From the given question the correct answer is:

C. sec θ = ½   is an incorrect trigonometric function.

As We know that,

the trignometric fuction which is incorrect

a) sin θ = – 1/5 is correct because since Sin θ ∈ [-1,1]

b) cos θ = 1 is correct because  Cos θ ∈ [-1,1]

c) sec θ = ½ ⇒ (1/cos θ) = ½ ⇒cos θ=2 is incorrect because

Cos θ ∈ [-1,1]

d) tan θ = 20 is correct since tan θ ∈ R.

Therefore, option (C) sec θ = ½ is the correct answer.