Arnold K H Tan's answer to Koh's Secondary 4 A Maths Singapore question.
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No choice but to assume part A = part B for the graph
Date Posted:
2 years ago
for the 1st point at (pi/6,8), the y value has decreased to 8 from the maximum at 11.
for the 2nd point at (pi/2), the y value has increase to 5 from the minimum at 2.
by symmetry of the sine & cosine curve, this means the interval between the max point and the 1st point, is exactly equal to the interval between the min point and the 2nd point.
so this tells us that part A = part B.
for the 2nd point at (pi/2), the y value has increase to 5 from the minimum at 2.
by symmetry of the sine & cosine curve, this means the interval between the max point and the 1st point, is exactly equal to the interval between the min point and the 2nd point.
so this tells us that part A = part B.
Thks!
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