Chapter 4.2, Problem 80PE

Practice Plus

In Exercises 33-42, let $\sin t=a,\cos t=b,\text{and}\tan t=c$.

Write each expression in terms of a, b, and c.

$-\cos t+7\cos (t+1000\pi )+\tan t+\tan (t+999\pi )+\sin t+\sin (t-1000\pi )$