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help with question (1 Viewer)
- Thread starter dabatman
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kawaiipotato
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- HSC
- 2015
thankyou = sin\theta cos2\theta + cos\theta sin 2\theta \\ \\ = sin\theta (1-2sin^2 \theta) + cos\theta (2sin\theta cos\theta) = sin\theta - 2 in^3 \theta + 2sin\theta (1-sin^2 \theta)\\ \\ = 3sin\theta - 4sin^3 \theta)
I know that this question was from a while ago, but the answer from the book says its "3sintheater x(times) cos2theater - sin3theater"
Do you mean?:
 - sin^3 \theta \\ \\ =3sin\theta - 3 sin^3 \theta - sin^3 \theta\\ \\ = 3sin\theta - 4sin^3 \theta )
Well this is the "unfinished" version of sin3@ to be expressed in terms of sin@ only. But looking at the question again, it only asked for an expression. The 2 are equivalent.
By the way: it is theta and not theater.
Well this is the "unfinished" version of sin3@ to be expressed in terms of sin@ only. But looking at the question again, it only asked for an expression. The 2 are equivalent.
By the way: it is theta and not theater.
Last edited: