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4-164.
  1. Rewrite the following using a single trigonometric function. You may wish to review your trigonometric identities in Chapter 1. Homework Help ✎

    1. 10 sin(3x) cos(3x)

    2. sin x cos 3x − sin 3x cos x

    3. cos4 x − sin4 x

    4. tan x + cot x

Double Angle identity (factor first).

Factor first.

Sum and Difference (Angle Sum) identity.

Start by rewriting tan(x) and cot(x) as fractions.

You will use more than one identity.