Se x é um número real tal que sen²x - 3senx = -2, x=?
a) π/2 + kπ, k ∈ Z
b) π/4 + kπ, k ∈ Z
c) π/2 + 2kπ, k ∈ Z
d) 3π/2 + kπ, k ∈ Z
e) 3π/2 + 2kπ, k ∈ Z
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