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- Thread starter Terrell
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- #2

blue_leaf77

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The latter is not a deduction from the former. It is simply a## Homework Statement

How did it go from A'x'^2 + Bx'y' + C'y'^2 + D'x' +E'y' + F = 0 to become B' = 2(C-A)sin(theta)cos(theta) + B(cos^2(theta) - sin^2(theta))?

The deduction is the equation immediately after the 'where...' part.

- #4

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yes. i got that part, but how do i get from the 2nd equation to the third equation?

- #5

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but how do i deduce it? what is step1? i don't know how to start.. from A'x'^2 + B'x'y' + ... + F = 0 to B' = 2(C - A)...The latter is not a deduction from the former. It is simply adefinition, which the author is free to make, as the symbol B' has not been used up to that point.

The deduction is the equation immediately after the 'where...' part.

- #6

blue_leaf77

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