Further maths Flashcards
2 trig identities
tanx = sinx / cosx
sin²x + cos²x =1
Binomial expansion
Rows of Pascal’s triangle?
First row = brackets to power of 0
Second row = brackets to power of 1
Third row = brackets to power of 2
Differentiation 2 steps
Multiply by power
Subtract 1 from power
How to work out the matrix transformations on the spot?
Use identity matrix and draw a the square on a graph. Use each of the two columns as co-ordinates, then transform the points. The end co-ordinates make the transformation matrix.
Matrix transformation for enlargement around the origin?
(k 0)
(0 k)
Matrix transformation for rotation 90 degrees clockwise around origin?
(0 1)
(-1 0)
Matrix transformation for rotation 90 degrees anticlockwise around the origin?
(0 -1)
(1 0)
Matrix transformation for rotation 180 degrees around the origin?
(-1 0)
(0 -1)
Matrix transformation for reflection in the x axis?
(1 0)
(0 -1)
Matrix transformation for reflection in the y axis?
(-1 0
(0 1)
Matrix transformation for reflection in the line y=x?
(0 1)
(1 0)
Matrix transformation for reflection in the line y= -x?
(0 -1)
(-1 0)
Key rule when combining matrix transformations?
Do them in the reverse order e.g transformation A followed by B is BA