Using Sine, Cosine, & Tangent Practice Test - SAT

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Two acute angles have measures $y^{\circ}$ and $z^{\circ}$ , and $\cos y^{\circ}=\sin z^{\circ}$ . If and , what is the value of ?

The three angles of a right triangle have measures $a^{\circ}$ , $b^{\circ}$ , and $c^{\circ}$ . If and $\cos a^{\circ}=\frac{3}{5}$ , what is $\sin b^{\circ}$ ?