# Maths Ext 2 Predictions/Thoughts (1 Viewer)

#### O01x

##### Active Member
The inequalities and vectors though, screw me lol

#### notme123

##### Well-Known Member
congrats to whoever solved the 5 marker in its entirety, i got like half way then the algebra was getting horrendous

#### TheShy

##### Active Member
16 a part 2 was cauchy swartz inequality for vectors, but I had no idea how to prove it lmao, hopefully I get 1 mark at least for doing some algebra

#### kkkyyy

##### New Member
Does anyone remember the answer for the integration (3+5cosx)^-1 or (5+3cosx)^-1? Is it (ln3)/4

#### notme123

##### Well-Known Member
16 a part 2 was cauchy swartz inequality for vectors, but I had no idea how to prove it lmao, hopefully I get 1 mark at least for doing some algebra
its dot product but rearrange for cos. since cos is in between -1 and 1, you but the a.b/|a||b| in between those then absolute value so its only less than 1.

#### FixItChris

##### New Member
Does anyone remember the answer for the integration (3+5cosx)^-1 or (5+3cosx)^-1? Is it (ln3)/4
That's what I got

#### oredbayz

##### New Member
congrats to whoever solved the 5 marker in its entirety, i got like half way then the algebra was getting horrendous

#### TheShy

##### Active Member
its dot product but rearrange for cos. since cos is in between -1 and 1, you but the a.b/|a||b| in between those then absolute value so its only less than 1.
Ah fuck yeh that's smart

#### oredbayz

##### New Member
Does anyone remember the answer for the integration (3+5cosx)^-1 or (5+3cosx)^-1? Is it (ln3)/4
that was easy 4 marks

#### notme123

##### Well-Known Member
Does anyone remember the answer for the integration (3+5cosx)^-1 or (5+3cosx)^-1? Is it (ln3)/4
i just realised i fkd the difference of squares part for that
i did (4-x)(4+x) far out, its (2-x)(2+x) wasnt it . oh well two more marks lost

#### oredbayz

##### New Member
i just realised i fkd the difference of squares part for that
i did (4-x)(4+x) far out, its (2-x)(2+x) wasnt it . oh well two more marks lost
u will lose 1 for ecf

#### Siwel

##### Active Member
the 5 marker was just dot product then sub in tof for t or atleast what i did

#### notme123

##### Well-Known Member
what did people get for the slope one. i got a surd within a surd for constant v. its just when forces = 0

#### notme123

##### Well-Known Member
the 5 marker was just dot product then sub in tof for t or atleast what i did
why did you sub in time of flight. i did dot product. then discriminant is greater than 0 to get a range for theta.

#### ExtremelyBoredUser

##### Bored Uni Student
What was q16! How did everyone find it.

#### vishnay

##### God
what did people get for the slope one. i got a surd within a surd for constant v. its just when forces = 0
wasnt it to 1dp

#### dbramley

##### New Member
what did people get for the slope one. i got a surd within a surd for constant v. its just when forces = 0
4. Something to 1dp??

#### vishnay

##### God
was it oh shit i dont think i did that
i just remember two questions having 1dp