SMO 2009 Senior Round 1 Question 5
SMO · SMO 2009 Senior Round 1
In a triangle $ABC$, $\sin A=\dfrac35$ and $\cos B=\dfrac5{13}$. Find $\cos C$.
$\frac{56}{65}$ or $\frac{16}{65}$
$\frac{56}{65}$
$\frac{16}{65}$
$-\frac{56}{65}$
$\frac{56}{65}$ or $-\frac{16}{65}$