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secondary 4 | A Maths
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hi why is there a squareroot applied to -1+cos210/2?
Date Posted: 3 years ago
Views: 260
They forgot the “square” in one of the lines preceding that line
ohh I see. so what's the missing step supposed to look like?
As in, after the line “2A = 210”, it should be “cos^2 105 = …” rather than “cos 105 = …”.
We simply take square root after that; however, we take the negative version because cos 105 is the cosine of a second-quadrant angle and its value is expected to be negative.
We simply take square root after that; however, we take the negative version because cos 105 is the cosine of a second-quadrant angle and its value is expected to be negative.
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done
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Just a typo
Date Posted:
3 years ago
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