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secondary 4 | A Maths
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Megan
Megan

secondary 4 chevron_right A Maths

Help!!!!! thank you :))))

Date Posted: 7 years ago
Views: 424

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Sao Chuan
Sao Chuan's answer
22 answers (A Helpful Person)
1st
For differentiation questions, always work from outside to inside.
In this case, the most outer function is "ln f(x)" [where f(x)=cos x] which differentiates to 1/f(x). Then, apply the chain rule to cos x which differentiates to -sin x.
Megan
Megan
7 years ago
how do you find the second part??