rewrite the expression in terms of the first power of cosine.

cos^3(x)sin^4(x)

To rewrite the expression cos^3(x)sin^4(x) in terms of the first power of cosine, we can make use of the trigonometric identity for sine and cosine squared:

sin^2(x) + cos^2(x) = 1

Rearranging this equation, we get:

sin^2(x) = 1 - cos^2(x)

Now let's substitute this into the given expression:

cos^3(x)sin^4(x) = cos^3(x)(sin^2(x))^2

Since sin^2(x) = 1 - cos^2(x), we can substitute this expression in our equation:

cos^3(x)(1 - cos^2(x))^2

Thus, the expression cos^3(x)sin^4(x) in terms of the first power of cosine is cos^3(x)(1 - cos^2(x))^2.