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NOTE: some students thought that e^(3-x)>=0. This is wrong. Eg: e^(-1)=1/(e^1), hence it is always positive

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NOTE: some students thought that e^(3-x)>=0. This is wrong. Eg: e^(-1)=1/(e^1), hence it is always positive

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How did an inequality become an equation? this is not acceptable

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How did an inequality become an equation? this is not acceptable

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Such slips occurs because students do not know how to do factorisation properly. STOP using your calculators!

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Such slips occurs because students do not know how to do factorisation properly. STOP using your calculators!

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Discouraged to work using dx/dy. Learn to express as (dy/dt)=(dy/dx)*(dx/dt)

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Discouraged to work using dx/dy. Learn to express as (dy/dt)=(dy/dx)*(dx/dt)

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After solving questions, always consider the validity of your answers against the context of the question

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After solving questions, always consider the validity of your answers against the context of the question

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STRONGLY DISCOURAGDED to use cases to solve inequality. SIMPLEST MTD: factorise and sketch the curve

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STRONGLY DISCOURAGDED to use cases to solve inequality. SIMPLEST MTD: factorise and sketch the curve

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Brackets are important! it means a different thing without 

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Brackets are important! it means a different thing without 

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When using fraction notation, numerator and denominator should only consist of integers. Giving 0.2 in numerator as a final answer is not acceptable.

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When using fraction notation, numerator and denominator should only consist of integers. Giving 0.2 in numerator as a final answer is not acceptable.

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Ambiguous: Is it product of neg sin x with the exponential function or sin of the product of x and the exponential function? Use brackets to make it clear.

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Ambiguous: Is it product of neg sin x with the exponential function or sin of the product of x and the exponential function? Use brackets to make it clear.

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Must include to the condition: "FOR ALL VALUES OF X" in the explanation. Can put it right at the start in the heading of the explanation. Must also explain that x^2>=0 and hence x^2+5>0

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Must include to the condition: "FOR ALL VALUES OF X" in the explanation. Can put it right at the start in the heading of the explanation. Must also explain that x^2>=0 and hence x^2+5>0

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Insert in missing answer statement (must have correct units)

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Insert in missing answer statement (must have correct units)

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Learn to simplify the expression entirely using Power and Quotient law, then proceed to differentiate. This is too tedious already. Keep your handwriting neat so that you will not confuse yourself.

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Learn to simplify the expression entirely using Power and Quotient law, then proceed to differentiate. This is too tedious already. Keep your handwriting neat so that you will not confuse yourself.

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For show qn, steps must be explicitly written out as final answer is already given. Awarded 1 out of 2 only when “2” is not explained 

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For show qn, steps must be explicitly written out as final answer is already given. Awarded 1 out of 2 only when “2” is not explained 