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3.6.1 Integration (A-level only)
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Question 48
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a.
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cos3x≡4cos3x−3cosx \cos 3x \equiv 4\cos^3 x - 3\cos x
cos
3
x
≡
4
cos
3
x
−
3
cos
x
[4]
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3
Grade answer
b.
Hence find, using algebraic integration,
∫0π6cos3x dx \int_{0}^{\frac{\pi}{6}} \cos^3 x \, dx
∫
0
6
π
cos
3
x
d
x
[4]
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3
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3.6.1 Integration (A-level only) Questions
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3.6.1 Integration (A-level only)
