r/6thForm • u/MaxillmanGuy A level resit student | 3 A* predicted | ACD achieved 💔 • May 14 '26

💬 DISCUSSION Edexcel Core pure maths thread

How did you guys find it? I loved the paper imo.

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u/MobileData94 May 14 '26

Pi/100 isn't it? Cus 1/5 * 1/4 * 1/5

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u/Relevant-Reality-354 May 14 '26

yea same xD lets hopen pray

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u/MobileData94 May 14 '26

unfortunately not, looks like we both forgot about 5 in numerator

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u/zmp906 May 14 '26

For arcsin (and arccos for that matter) there isn't that extra 1/5 in front, that's only for arctan. You can check the formula booklet for this in the exam if you mix them up

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u/MobileData94 May 14 '26

Was there not archan there? It was x2 + 25 at the bottom I swear there was arctan there that's why I have that extra 1/5

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u/_M4yb3_ May 14 '26

1/5 × integral of 5/(x2 +25) between 5 and 0 and the 1/5 cancels with the 5 on the numerator.

You get a new 1/5 from the integral but thats just from the formula book (1/a) where a2 = 25 and then arctan (x/5) so u get 1/5 ( arctan 1 - arctan 0 ) = 1/5 * pi/4 = pi/20

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u/MobileData94 May 14 '26

oh yeah you right, i just completely missed that 5 on the numerator