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Competition - post a photo you've taken of nature >>

double angle

ImageUploadedByStudent Room1447002367.189494.jpg
Hi
Can anyone help me to proof this question.


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Zacken
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Original post by 123321123
ImageUploadedByStudent Room1447002367.189494.jpg
Hi
Can anyone help me to proof this question.


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Where did the xx come from?
Reply 2
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Zacken
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Original post by 123321123
ImageUploadedByStudent Room1447002367.189494.jpg
Hi
Can anyone help me to proof this question.


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Assuming you mean θ\theta then I agree with θ+12sin⁡2θ+c\theta + \frac{1}{2} \sin 2\theta + c - which is it, the question is wrong, it's off by a factor of 2.
(edited 8 years ago)
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123321123
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Oh it should be a theta.


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123321123
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Original post by Zacken
Assuming you mean θ\theta then I agree with θ+12sin⁡2θ+c\theta + \frac{1}{2} \sin 2\theta + c


Then, how can I prove the question?


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Zacken
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Original post by 123321123
Then, how can I prove the question?


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You're done, the question is wrong, your answer is correct.
Original post by 123321123
ImageUploadedByStudent Room1447002367.189494.jpg
Hi
Can anyone help me to proof this question.


Posted from TSR Mobile


I cant help you, sorry.
Original post by 123321123
Then, how can I prove the question?


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cos(2θ)=cos2(θ)−sin2(θ)=2cos2(θ)−1cos(2\theta) = cos^2(\theta) - sin^2(\theta) = 2cos^2(\theta) - 1
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123321123
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Original post by Zacken
You're done, the question is wrong, your answer is correct.


ImageUploadedByStudent Room1447003289.539591.jpg
Is the question wrong?


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123321123
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2
Original post by Zacken
You're done, the question is wrong, your answer is correct.


Q6


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Reply 10
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Zacken
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Original post by 123321123
ImageUploadedByStudent Room1447003289.539591.jpg
Is the question wrong?


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yes

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