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Method of calculation from the BPF Code of Practice wrong ?

Method of calculation from the BPF Code of Practice wrong ?

(OP)

Hi,

I have an example of roof load calculations - from the British Plastics Federation Code of Prctice, (top right column) found here: http://postimg.org/image/y5tyi0bsr/

I have consulted these two maths forums - and they confirm the equation is incorrect, see here:
http://www.purplemath.com/learning/viewtopic.php?f=12&t=5948&p=13038&sid=9f195b07c00ec517fce78b1be4f2ba3d#p13038
http://www.freemathhelp.com/forum/threads/93522-Help-with-equation-for-roof-loading-2x-%283-2%29Cos%2845%29-x-1-x-2-25-9-54?p=383902#post383902

I have come here to hopefully get a structural engineers view on this simple equation mistake, maybe there is something I am missing - and it is not a mistake , be interested to get any opinions.

Thanks

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