Question

1) A qual quadrante pertence o ângulo de 15π/4 radianos?
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Answer 1

$\boxed{\begin{array}{l}\sf\dfrac{15\pi}{4}=\dfrac{8\pi}{4}+\dfrac{7\pi}{4}=2\pi+\dfrac{7\pi}{4}\\\sf pertence~ao~4^o~quadrante\end{array}}$