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Lim Jing Yu
Lim Jing Yu

# chevron_right Malaysia

how to solve these two question? integration

Date Posted: 4 months ago
Views: 25
Eric Nicholas K
Eric Nicholas K
4 months ago
You cannot integrate two terms like that. As in, you cannot integrate sin 3x and cos x like that. Integrating the product of two things is not the same as integrating each one, then taking their product.

You must use the addition angle formula first.
Eric Nicholas K
Eric Nicholas K
4 months ago
And it's not 'dy/dx = integrate...' unless the equation started out a d2y/dx2.

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Eric Nicholas K
Eric Nicholas K's answer
2976 answers (Tutor Details)
Given answer for Q27 is incorrect.

That answer is correct only if the question starts out as dy/dx = cos 5x cos x + sin 5x sin x.