Muhammad Ahshiq Bin V M Abdul Muthaliff's answer to :)'s Secondary 4 A Maths Singapore question.
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I believe the question has a typo or not stated clearly, it wants you to calculate dy/dt when x= pi/6.
When you differentiate the expression, you would get 2sec^2(2x + pi/2) which cannot be keyed into some calculators. Hence you can change it to 2 / cos^2 (2x+ pi/2)
cos^2 may not be able to keyed in some calculators, so you may change it to [cos(2x + pi/2)]^2. Both expressions will evaluate to the same result.
Finally make sure to set your calculator to radian mode before calculating to arrive at the correct answer.
When you differentiate the expression, you would get 2sec^2(2x + pi/2) which cannot be keyed into some calculators. Hence you can change it to 2 / cos^2 (2x+ pi/2)
cos^2 may not be able to keyed in some calculators, so you may change it to [cos(2x + pi/2)]^2. Both expressions will evaluate to the same result.
Finally make sure to set your calculator to radian mode before calculating to arrive at the correct answer.
Date Posted:
3 years ago
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