Kai Chew's answer to Yong Quan's Secondary 4 A Maths Singapore question.
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The drawing above is the graph of y=cos(x)
y= cos(x) curve intersects the y=1/2 line 4 times before the 4pi mark.
Hence, there are 4 solutions before x=4pi
therefore, k=4
y= cos(x) curve intersects the y=1/2 line 4 times before the 4pi mark.
Hence, there are 4 solutions before x=4pi
therefore, k=4
Date Posted:
1 year ago
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