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Maths, Addmaths and Statistics: Post your doubts here!

asd

asd

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a.abid said:
Thanks alot (y) But arent there other formulas for each type of transformation? Cuz we have done like specific kind of matrices for each kind of transformatin e.g for 90 degrees clockwise rotation the transformation matrice is
(0 1)
(-1 0)
Click to expand...
Umm, yes.
For shear along x-axis it is :
(1 k)
(0 1)
And for shear along y-axis it is:
(1 0)
(k 1)
For stretch, parallel to x-axis (y-axis as invariant) it is:
(k 0)
(0 1)
And for stretch parallel to y-axis(x-axis as invariant) it is:
(1 o)
(o k)
For double stretch:
(k1 0)
(o k2)
where k1 is the stretch factor for stretch parallel to x-axis, and k2 for stretch parallel to y-axis
For rotation, i already posted the shortcut methods.
 
Spidey21

Spidey21

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CAN SOME ONE TELL ME THAT CAN I USE ADD MATHS FORMULAS IN MATHS??
For instance they say find the gradient of
x-3y=6
can i differentiate it although without calculating i can tell its -1 :D
 
syed1995

syed1995

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Spidey21 said:
CAN SOME ONE TELL ME THAT CAN I USE ADD MATHS FORMULAS IN MATHS??
For instance they say find the gradient of
x-3y=6
can i differentiate it although without calculating i can tell its -1 :D
Click to expand...

actually the gradient for that will be -1/3. lol and no we can't .. we can only check our answers with that .. but nothing more than that ...

I wish we could use differentiation in geometry, integration in finding the area under curves :D and that y-y1=m(x-x1) .. would make like so much easier ..
 
asd

asd

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syed1995 said:
actually the gradient for that will be -1/3. lol and no we can't .. we can only check our answers with that .. but nothing more than that ...

I wish we could use differentiation in geometry, integration in finding the area under curves :D and that y-y1=m(x-x1) .. would make like so much easier ..
Click to expand...
Was about to correct the gradient, and then i saw your post. :D
 
A

A star

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Spidey21 said:
CAN SOME ONE TELL ME THAT CAN I USE ADD MATHS FORMULAS IN MATHS??
For instance they say find the gradient of
x-3y=6
can i differentiate it although without calculating i can tell its -1 :D
Click to expand...
oh please do u really need addmath for that:p
rabiafarooq101 said:
how many papers should one do for an A*???:eek:
Click to expand...
5 -7 in my view 5 old for practice and 2 new fr pattern
 
syed1995

syed1995

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A star said:
really? i have seen many people with A in addmath and a B in maths:p. though it makes it easy but not a peace of cake.
Click to expand...

hahaha .. Maths is tricky, while addmaths is purely straight forward.. if you have done enough past papers getting an A* is easy as hell in addmaths .. but in maths they tend to give tricky questions so getting the grip on the concepts is the real deal in maths rather than the past papers .. take mensuration for example .. half filled cylinder with a hemisphere at the end .. find its surface area .. now we don't have the formula in our course but we have to use the concept we have to derive our own equations and find the surface area ..
 
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