SMO 2022 Senior Round 1 Question 5
SMO · SMO 2022 Senior Round 1
Suppose $\sin(180^\circ+x)=-\dfrac79$, where $450^\circ\lt x\lt 540^\circ$. Find $\sin(2x)$.
$\dfrac{49}{81}\sqrt2$
$\dfrac{56}{81}\sqrt2$
$-\dfrac{56}{81}$
$-\dfrac{49}{81}\sqrt2$
$-\dfrac{56}{81}\sqrt2$