Mathematics: Post your doubts here!

[ZaqZainab]

id rather do it the hard way than to rote learn formulas :/

can you show me the hard way?

 

[Rutzaba]

bhai dekho
if cos x= p
cos^2 x= p^2
1- cos^2 x= 1- p^2
sin^2 x= 1-p^2 <---- cos square plus sin square =1
sin x= root of 1- p^2

second part
tan= sin/cos
see sin in terms of p divided by cos in terms of p
tan x=(root of 1- p^2)/p

 

[Rutzaba]

not exactly hard. lengthy

 

[ZaqZainab]

i wasn't talking about this equation for this that is the only way
i was talking about (iii) ??
how would you do that?

 

[Rutzaba]

i wasn't talking about this equation for this that is the only way
i was talking about (iii) ??
how would you do that?

hmm u hav a point...

 

[ZaqZainab]

hmm u hav a point...

for that i have to learn those formulas and i hate learning formulas
as for (i) and (ii) we use those simple formulas from data booklet

 

[Rutzaba]

for that i have to learn those formulas and i hate learning formulas
as for (i) and (ii) we use those simple formulas from data booklet

poor u

 

[Thought blocker]

u sure they in our course? cux we certainly dint learn em

Actually, I studied by my own, no teachers in our hell school. :'(
And yes, it is asked in papers, it is a part of syllabus.

 

[Rutzaba]

i wasn't talking about this equation for this that is the only way
i was talking about (iii) ??
how would you do that?

i remember nowww
theres another formula to open this a bit lengthy

 

[Rutzaba]

tan (a-b)= (tan a-tanb)/ (tana tanb)
but i think this is p3

 

[ZaqZainab]

i remember nowww
theres another formula to open this a bit lengthy

another formula to cover up 1 formula?
anyways what is it?

 

[Thought blocker]

i wasn't talking about this equation for this that is the only way
i was talking about (iii) ??
how would you do that?

the third part is crap. :/

 

[Thought blocker]

tan (a-b)= (tan a-tanb)/ (tana tanb)
but i think this is p3

yes it is.
Suchal Riaz, help us darling.

 

[Rutzaba]

another formula to cover up 1 formula?
anyways what is it?

the formula u presented was not a formula
it was sumthing like in phy wen we memorize the value of constants.
this how ever is a real formula which is quite often tested in p3 level trig so we naturally know this 1.

 

[ZaqZainab]

tan (a-b)= (tan a-tanb)/ (tana tanb)
but i think this is p3

haven't heard about it
i guess it is p3 then

 

[Rutzaba]

theres one to open sin and cos and tan seperately

 

[Rutzaba]

haven't heard about it
i guess it is p3 then

anyways best of luck memorizing . :*

 

[ZaqZainab]

the formula u presented was not a formula
it was sumthing like in phy wen we memorize the value of constants.
this how ever is a real formula which is quite often tested in p3 level trig so we naturally know this 1.

its made up from a triangle actually
using the Sin(thetha)= O/H .......
can you do part iii using it?

 

[Rutzaba]

yeah... not sure if im supposed to do it in degrees or radians.
tan 90 -tan theta / tan 90 tan theta
-2 -tan theta/ -2tan theta

 

[Rutzaba]

its made up from a triangle actually
using the Sin(thetha)= O/H .......
can you do part iii using it?

its too lengthy