Boy Mow Chau's answer to Irah Athirah's Secondary 4 A Maths Singapore question.
done
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although the final answer for the angle seems a bit unusual, a check against a computer plot of the curve shows that the answer to be correct.
the computer plot of the curve is shown for reference.
the computer plot of the curve is shown for reference.
Date Posted:
4 years ago
we use dA/d0 = 0 to find the turning point.
although the question does not state that it is necessary to check that this turning point is a maximum point, it is a good practice to do a final check using 1st or 2nd derivative test. this helps to check in case we have made a mistake in the working somewhere.
although the question does not state that it is necessary to check that this turning point is a maximum point, it is a good practice to do a final check using 1st or 2nd derivative test. this helps to check in case we have made a mistake in the working somewhere.
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