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[Riproot]

and which is correct?
http://latex.codecogs.com/gif.latex?Does&space;(a-b)^2&space;-&space;c^2&space;=&space;(a-b+c)&space;(a+b-c)&space;OR&space;(a-b+c)(a-b-c)
my stupid textbook is defying the laws of maths

What? :S

 

[SpiralFlex]

the 1st equation.
Sorry i was looking at parabolas when i was writing that.

Thanks for the help.
How many hours a day do you study regularly? i.e not around exam time

Whenever you finish studying: How does the t result for cot X tan = 1+t^2/2t ?

and which is correct?
http://latex.codecogs.com/gif.latex?Does&space;(a-b)^2&space;-&space;c^2&space;=&space;(a-b+c)&space;(a+b-c)&space;OR&space;(a-b+c)(a-b-c)
my stupid textbook is defying the laws of maths

Have you done your t formulae yet?