Question

Si: Tg x + Ctg x= 3
Hallar: (Sen x + Cos x)^2
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Answer 1

$(sen(x) + cos(x) {)}^{2} \\ \sin(x {)}^{2} + 2 \sin(x) \cos(x) + \cos(x {)}^{2} \\ \\ 1 \sin(2x)$