A few days ago
High School Math question TRIG simplify 4cos^2(6x)-2?
the possible answers are
2cos3x
4cos3x
2cos12x
4cos12x
Thanks in advance, also please tell me how you did it, not just the answer…
Top 1 Answers
A few days ago
Favorite Answer
Use the formula:
2cos^2(a) – 1 = cos(2a)
putting a = 6x.
Then:
2cos^2(6x) – 1 = cos(12x)
Doubling:
4cos^2(6x) – 2 = 2cos(12x).
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