## Precalculus (6th Edition) Blitzer

csc is the reciprocal of sin: csc t = $\frac{1}{sin t}$. so csc1.7 = $\frac{1}{sin 1.7}$. sin 1.7 csc 1.7 = sin 1.7$\frac{1}{sin 1.7}$ = 1.