John Oon's answer to Anonymous's Secondary 3 A Maths Singapore question.
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See photo.
As cos (x/2) is - 0.5 . It lies in 2nd or 3rd Quadrant.
If it is positive it will lie in 1st or 4th quadrant.
As cos (x/2) is - 0.5 . It lies in 2nd or 3rd Quadrant.
If it is positive it will lie in 1st or 4th quadrant.
Date Posted:
2 years ago
one of the solutions is rejected right? 8π/3
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