Integration Rules and Techniques
If they are both raised to an even power, use a half-angle formula (cos2(x) = 1 2 (1 + cos(2x)) or sin2(x) = 1 2 (1 cos(2x))) to convert to cosines, expand the result and apply half-angle formulas again if needed (keep doing this until you no longer have any powers of cosine), then integrate (may need a simple u-sub).
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