In Exercises 33–42, let sin t = a, cos t = b, and tan t = c. Write each expression in terms of a, b, and c. 3 cos(-t) - cos t

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Recall the even-odd properties of trigonometric functions: cosine is an even function, so $\cos(-t) = \cos t$.

Substitute $\cos(-t)$ with $\cos t$ in the expression: $3 \cos(-t) - \cos t$ becomes $3 \cos t - \cos t$.

Combine like terms: $3 \cos t - \cos t = (3 - 1) \cos t = 2 \cos t$.

Since $\cos t = b$, rewrite the expression in terms of $b$: \$2b$.

Thus, the expression $3 \cos(-t) - \cos t$ simplifies to \$2b$.

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