Which of the following is not correct?
We know that,
a) 
is correct since Sin θ ∈ [-1,1]
b) cos θ = 1 is correct since Cos θ ∈ [-1,1]
c) 
⇒cos θ=2 is incorrect since Cos θ ∈ [-1,1]
d) tan θ = 20 is correct since tan θ ∈ R.
e)
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