Math mini-contest trigonometry problem for Day 1 on D.Buzz for May 2021 ๐Ÿ˜Ž

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Math mini-contest trigonometry problem for Day 1 on D.Buzz for May 2021 ๐Ÿ˜Ž

Manuel found that cos (2ฮธ) = -7 and ฮธ is not in the first quadrant. To remember it more easily, he wants to convert cos (2ฮธ) into sin (ฮธ). What is the value of sin (ฮธ)?

math mathematics dbuzz minicontest trigonometry
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the question above is out of syllabus form me...

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I got confused about your statement. ๐Ÿคฏ Do you mean that my Math problem for today is not a part of your syllabus when you were still a student (in high school)? ๐Ÿค”๐Ÿ˜ฎ

Anyway, please have some !PIZZA! ๐Ÿ•๐Ÿ˜

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ahahha
Not that was not the meaning...
It was 12 year back when I have solved any trigonometry problem so for now its out of syllabus form me...

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You might want to review trigonometry and join this Math mini-contest! ๐Ÿ˜ Who knows if some student would approach you and ask you to help solve a trigonometry problem! ๐Ÿ˜…

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hmm, I probably don't fully get the problem, but I'd say there is no solution: cos() has a value range of [-1, 1], so there's no 2ฮธ where cos(2ฮธ) can be -7.

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