This problem is about using power reducing formulas. What we do in this concept is substitute a given trig function with a power reducing formula to create a whole new equation. In the new equation, we will create a reduced formula. In the reduced formula, the highest power should be to the first power. If it is not, we keep reducing until we do so.
When watching this video, make sure that we reduce the equation fully. Also make sure to foil correctly. When foiling, multiplying the same trig function with itself, ADDS the exponents. Some make the mistake of actually multiplying them which is not correct so be careful. Also make sure to reduce it fully before giving the final answer.
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