Boy Mow Chau's answer to trish's Junior College 1 H2 Maths Singapore question.
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there is a printing mistake in the question. from the sketch, the region between curve c and the line is in the 3rd quadrant, where y>0 instead of y<0.
(the actual question in the original exam paper only gives x<0, no mention of y)
for any volume formed that involves a straight line, can just calculate as volume of cone or cylinder, instead of integrating.
when the question ask for exact area, can & should still use GC to verify the final answer.
(the actual question in the original exam paper only gives x<0, no mention of y)
for any volume formed that involves a straight line, can just calculate as volume of cone or cylinder, instead of integrating.
when the question ask for exact area, can & should still use GC to verify the final answer.
Date Posted:
2 years ago
(sorry, typos in above comments)
... the region between the curve and the line is in the *2nd* quadrant ...
... when the question ask for exact area *or exact volume*, can & should still use GC to verify the final answer ....
... the region between the curve and the line is in the *2nd* quadrant ...
... when the question ask for exact area *or exact volume*, can & should still use GC to verify the final answer ....
thank you so much!!
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