# General Thoughts: Mathematics Extension 1 (2 Viewers)

#### sluggo

##### New Member
its known that sinx/x = 1

so lim x-> 3 1/(x+2) = 1/5
But sinx/x =1 only for small angles, so it doesn't have the same effect when x-->3

#### fionaying

##### New Member
11c x does not equal to -3

#### spatula232

##### Active Member
I got cot13 and cot15 in the 3D trig Q. THERE'S NO COT ON THE BLOODY CALCULATOR!! HOW CAN I POSSIBLY DO THAT?!?

#### t_davis9

##### New Member
I got cot13 and cot15 in the 3D trig Q. THERE'S NO COT ON THE BLOODY CALCULATOR!! HOW CAN I POSSIBLY DO THAT?!?
rip 1 mark

Last edited:

#### RealiseNothing

##### what is that?It is Cowpea
I got cot13 and cot15 in the 3D trig Q. THERE'S NO COT ON THE BLOODY CALCULATOR!! HOW CAN I POSSIBLY DO THAT?!?
tan? lol

#### turnerloos

##### TAFE Executive Officer
exam was fair imo

#### kawaiipotato

##### Well-Known Member
I got cot13 and cot15 in the 3D trig Q. THERE'S NO COT ON THE BLOODY CALCULATOR!! HOW CAN I POSSIBLY DO THAT?!?
1/tan or tan(90-theta)

lol

#### Catz

##### Member
Harder than last years paper

#### Sarthakgarg

##### New Member
For the projectile question (14aii), I equated x = vtcos(theta) and x = (v^2sin2(theta))/g, as they both equal x.

Then, simplifying on both sides, I get theta = sin-1 (1/√3)

#### Wolf97

##### New Member
What would 48/70 scale to?

#### My two cents

##### New Member
Bloody hell silly mistakes

#### luhanbby

##### Member
hey guys if I got 59/70 is that a band 5? I also wrote root(11/4) for the n value idk if they'll take a mark off for not simplifying to root(11) / 2

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#### thomasdo1

##### Member
hey guys if I got 59/70 is that a band 5? I also wrote root(11/4) for the n value idk if they'll take a mark off for not simplifying to root(11) / 2

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def b6 m8

I marked myself, fml I got 66/70

I did the 3d trig in radians LOL

#### SlimiJay

##### Member
what does 67/70 align to?

#### luhanbby

##### Member
def b6 m8

I marked myself, fml I got 66/70

I did the 3d trig in radians LOL
you did so well though!! I'm a pretty average 3u kid lmao

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#### thomasdo1

##### Member
you did so well though!! I'm a pretty average 3u kid lmao

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haha yeah, my schools ranked in the 100's or 200's

#### eccentricity

##### New Member
Hey guys, for the projectile motion question, are we supposed to write pi/6 or 5pi/6 if it asks for the angle that the particle makes with the horizontal?

#### Flop21

##### Well-Known Member
I got cot13 and cot15 in the 3D trig Q. THERE'S NO COT ON THE BLOODY CALCULATOR!! HOW CAN I POSSIBLY DO THAT?!?
cot = 1/tan

did so shit fml