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Mathematics: Post your doubts here!

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:3 my teacher gave those maybe there is another method but this is the shortest you just 1 mark so they don't expect you to show working for this kind of equation
id rather do it the hard way than to rote learn formulas :/
 
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i wasn't talking about this equation for this that is the only way
i was talking about (iii) ??
how would you do that?
 
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the formula u presented was not a formula
it was sumthing like in phy wen we memorize the value of constants.
this how ever is a real formula which is quite often tested in p3 level trig so we naturally know this 1.
its made up from a triangle actually
using the Sin(thetha)= O/H .......
can you do part iii using it?
 
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