quick question about exams

[Flaming_Arrow]

do they expect us to know any formulas that are not in the Formula sheet? i mean like surface area/volume formulas etc.

[plato]

do they expect us to know any formulas that are not in the Formula sheet? i mean like surface area/volume formulas etc.

There are many such formulas on the formula sheet already. I do not expect that any other extraneous volume or area formulas would have to be remembered. You would be expected to be able to use combinations of the ones given. You would also be expected to understand the relevant units and conversions between cent- and milli- and kilo- etc.

You can be examined on all mathematics in the four semester Methods course. So any formulas or methods used in year 11, such as Combinations and Permutations, could be examined. Pythagoras' formula would be assumed knowledge but things like the Sine and Cosine rules would be unfair expectations. I do not believe you would be expected to remember or have these rules. You are expected to know the trig ratios.

[khalil]

do they expect us to know any formulas that are not in the Formula sheet? i mean like surface area/volume formulas etc.

There are many such formulas on the formula sheet already. I do not expect that any other extraneous volume or area formulas would have to be remembered. You would be expected to be able to use combinations of the ones given. You would also be expected to understand the relevant units and conversions between cent- and milli- and kilo- etc.

You can be examined on all mathematics in the four semester Methods course. So any formulas or methods used in year 11, such as Combinations and Permutations, could be examined. Pythagoras' formula would be assumed knowledge but things like the Sine and Cosine rules would be unfair expectations. I do not believe you would be expected to remember or have these rules. You are expected to know the trig ratios.

Plato, what about symmetry properties?

[kurrymuncher]

do they expect us to know any formulas that are not in the Formula sheet? i mean like surface area/volume formulas etc.

There are many such formulas on the formula sheet already. I do not expect that any other extraneous volume or area formulas would have to be remembered. You would be expected to be able to use combinations of the ones given. You would also be expected to understand the relevant units and conversions between cent- and milli- and kilo- etc.

You can be examined on all mathematics in the four semester Methods course. So any formulas or methods used in year 11, such as Combinations and Permutations, could be examined. Pythagoras' formula would be assumed knowledge but things like the Sine and Cosine rules would be unfair expectations. I do not believe you would be expected to remember or have these rules. You are expected to know the trig ratios.

Plato, what about symmetry properties?

yeah, you have to know the symmetry properties.

[TrueTears]

Just wondering, how can you even do circular functions without symmetry properties? Shouldn't they be ingrained in your head? lol

[khalil]

how can i memorise this

cos(pie/2+x)=-sinx

[NE2000]

You should know by now that if you enter sin(25) (degree mode) in your calculator it is the same as cos(65). That is sin(x) = cos(90 - x) given that x is from [0, 90].

So what if you enter cos(105), that should be the same as sin(155) right [180-25 = 155]? Which is the same as sin(25)? But sin is positive in the 2nd quadrant and cos is negative. So there has to be sign change.

[Ilovemathsmeth]

how can i memorise this

cos(pie/2+x)=-sinx

best to visualise it. it makes heaps more sense when you draw it. always always draw it.

however, to memorise: think of it in terms of this: cos is negative in quadrant 2 which clearly is pi/2 + x. thing is, for a pi/2 thingy they reverse, so cos would become sin. just make it neg sin then.