Question

7)Qual o valor da cotg 150° ? a) - √3 b) 1 2 c) √3 d) - √3 2 e) - 1 2 8)Dado sen x = 3 5 e 0 < x < 2 , qual o valor de cos x ?


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Answer 1

$\large\boxed{\begin{array}{l}\rm tg(150^\circ)=-tg(30^\circ)=-\dfrac{1}{\sqrt{3}}=-\dfrac{\sqrt{3}}{3}\\\\\rm cotg(150^\circ)=-\sqrt{3}\\\huge\boxed{\boxed{\boxed{\boxed{\rm\dagger\red{\maltese}~\blue{alternativa~a}}}}}\end{array}}$