Further maths Flashcards

1
Q

2 trig identities

A

tanx = sinx / cosx
sin²x + cos²x =1

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2
Q

Binomial expansion
Rows of Pascal’s triangle?

A

First row = brackets to power of 0
Second row = brackets to power of 1
Third row = brackets to power of 2

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3
Q

Differentiation 2 steps

A

Multiply by power
Subtract 1 from power

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4
Q

How to work out the matrix transformations on the spot?

A

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.

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5
Q

Matrix transformation for enlargement around the origin?

A

(k 0)
(0 k)

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6
Q

Matrix transformation for rotation 90 degrees clockwise around origin?

A

(0 1)
(-1 0)

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7
Q

Matrix transformation for rotation 90 degrees anticlockwise around the origin?

A

(0 -1)
(1 0)

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8
Q

Matrix transformation for rotation 180 degrees around the origin?

A

(-1 0)
(0 -1)

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9
Q

Matrix transformation for reflection in the x axis?

A

(1 0)
(0 -1)

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10
Q

Matrix transformation for reflection in the y axis?

A

(-1 0
(0 1)

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11
Q

Matrix transformation for reflection in the line y=x?

A

(0 1)
(1 0)

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12
Q

Matrix transformation for reflection in the line y= -x?

A

(0 -1)
(-1 0)

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13
Q

Key rule when combining matrix transformations?

A

Do them in the reverse order e.g transformation A followed by B is BA

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