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प्रश्न
Which of the following is not correct?
पर्याय
sinθ = `-1/5`
cosθ = 1
secθ = `1/2`
tanθ = 20
MCQ
उत्तर
`bbunderline(secθ = 1/2)`
Explanation:
We know that,
a) sinθ = `-1/5` is correct since sinθ ∈ [-1, 1]
b) cosθ = 1 is correct since cosθ ∈ [-1, 1]
c) secθ = `1/2`
⇒ `(1/cos θ) = 1/2`
⇒ cosθ = 2 is incorrect since cosθ ∈ [-1, 1]
d) tanθ = 20 is correct since tanθ ∈ R.
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