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Questions and Answers
Which of the following is an example of a Pythagorean identity?
Which of the following is an example of a Pythagorean identity?
- $\tan(x + y) = \frac{\tan(x) + \tan(y)}{1 - \tan(x)\tan(y)}$
- $\sin^2(x) + \cos^2(x) = 1$ (correct)
- $\sin(2x) = 2\sin(x)\cos(x)$
- $\sin(x + y) = \sin(x)\cos(y) + \cos(x)\sin(y)$
Which of the following is an example of a co-function identity?
Which of the following is an example of a co-function identity?
- $\sin(\frac{\pi}{2} - x) = \cos(x)$ (correct)
- $\tan(x + y) = \frac{\tan(x) + \tan(y)}{1 - \tan(x)\tan(y)}$
- $\sin(x + y) = \sin(x)\cos(y) + \cos(x)\sin(y)$
- $\sin(2x) = 2\sin(x)\cos(x)$
Which of the following is an example of a sum & difference identity?
Which of the following is an example of a sum & difference identity?
- $\tan(x + y) = \frac{\tan(x) + \tan(y)}{1 - \tan(x)\tan(y)}$
- $\sin(2x) = 2\sin(x)\cos(x)$
- $\sin(x + y) = \sin(x)\cos(y) + \cos(x)\sin(y)$ (correct)
- $\sin(\frac{\pi}{2} - x) = \cos(x)$
Which of the following is an example of a double angle identity?
Which of the following is an example of a double angle identity?
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Which of the following is an example of a half-angle identity?
Which of the following is an example of a half-angle identity?
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