Further Pure Mistakes Collection
Vectors
Mistakes
• To find the smallest angle between planes, we need to find the normal of the planes and use dot
product to find the angle between. not using dot product to just find the angle of vectors
• Remember the alternative form
• Remember how the direction cosines work
- It relates to the direction vector, t is parallel to it
Conic Sections
Mistakes
• You may need to switch the x and y coordinates from the formula book as it only shows the standard
form
• Possible to do transformation
• The eccentricity is the ratio between the general point of the curve and the foci to the directrices
(must be perpendicular)
P ( foci )
e=
P ( directices )
- P is the general point on the curve
Vectors
Mistakes
• To find the smallest angle between planes, we need to find the normal of the planes and use dot
product to find the angle between. not using dot product to just find the angle of vectors
• Remember the alternative form
• Remember how the direction cosines work
- It relates to the direction vector, t is parallel to it
Conic Sections
Mistakes
• You may need to switch the x and y coordinates from the formula book as it only shows the standard
form
• Possible to do transformation
• The eccentricity is the ratio between the general point of the curve and the foci to the directrices
(must be perpendicular)
P ( foci )
e=
P ( directices )
- P is the general point on the curve
