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# C4 Integration Mark Allocation watch

1. Hey all. For part c of this question I first expanded the brackets to give

Then, because I've memorised the integral of to be

, I simply integrated to give

which further simplifies into

after plugging in the values of t, it works out to

which is the correct answer, but the mark scheme says that there must be a correct use of a double angle formula, which I didn't use.
Does this mean that you can't just memorize integrals such as or even if they lead you to the correct answer?

Attachment 539723539725
Attachment 539723539725
Attached Images

2. (Original post by The_Big_E)
Hey all. For part c of this question I first expanded the brackets to give

Then, because I've memorised the integral of to be

, I simply integrated to give

which further simplifies into

after plugging in the values of t, it works out to

which is the correct answer, but the mark scheme says that there must be a correct use of a double angle formula, which I didn't use.
Does this mean that you can't just memorize integrals such as or even if they lead you to the correct answer?

Attachment 539723539725
Attachment 539723539725
Technically speaking, you still used the double angle formula correctly.

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