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# Maths help

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1. can anyone explain to me how to calculate this (on attachment)
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2. (Original post by tc32)
can anyone explain to me how to calculate this (on attachment)
Integrate it using substitution given.
3. (Original post by RDKGames)
Integrate it using substitution given.
4. (Original post by tc32)
It's a modulus of the function; so everything in the negative y flips over to positive y. Imagine 40 of those 'humps' (with area A) going across and you can find out where the last one hits the x-axis, that would be your
5. Sub kpi and zero into integral and equate it to 40*your A?
6. (Original post by TSRPAV)
Sub kpi and zero into integral and equate it to 40*your A?
No need to mess around with any integrals, to be honest, that would just take longer. Observe the pattern of the modulus. If the boundary for A is between 0 and , then obviously the boundary for 40A would be between 0 and
7. (Original post by RDKGames)
It's a modulus of the function; so everything in the negative y flips over to positive y. Imagine 40 of those 'humps' (with area A) going across and you can find out where the last one hits the x-axis, that would be your
I didn't notice that. Thanks for the help, its a whole lot clearer now.

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