A Maths Trigo
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When u encounter a qn like..
sin x = -1/2
Do u leave out the minus sign when keying it in the calculator to find the basic angle? -
yes
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Ok but in the later part we must identify it to be in the 3rd and 4th quadrant because it is sin negative?
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yes
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yepOriginally posted by lpx88:Ok but in the later part we must identify it to be in the 3rd and 4th quadrant because it is sin negative?
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ehh boy, prelims in two weeks leh you still asking this kinda qns...
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Alright...
K i reached this part alrdy..
2x=210 degrees,330 degrees
So i must add 360 degrees to each angle and then divide by two to get the 4 final answers? -
Just to make sure mah..hows yr revisionOriginally posted by tut4nkh4m3n:ehh boy, prelims in two weeks leh you still asking this kinda qns... -
duh. u're rightOriginally posted by lpx88:Alright...
K i reached this part alrdy..
2x=210 degrees,330 degrees
So i must add 360 degrees to each angle and then divide by two to get the 4 final answers? -
just divide by two i thought?Originally posted by lpx88:Alright...
K i reached this part alrdy..
2x=210 degrees,330 degrees
So i must add 360 degrees to each angle and then divide by two to get the 4 final answers?
i'm not too gd with trigo too. but if you alr know 2x is 210 and 330, and you wana find x, isn't it just dividing by two? -
you must see the 4 quardrants ma
sine negative...
3rd and 4th quardant
180 + basic angle / 2
360 - basic angle / 2
get the ans lohs -
er..i think you still gotta add 360 because its a double angle or something like that?Originally posted by tut4nkh4m3n:just divide by two i thought?
i'm not too gd with trigo too. but if you alr know 2x is 210 and 330, and you wana find x, isn't it just dividing by two?
i havent touched trigo for a year.
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my permutations/combinations/sets/log/surds/identitiesOriginally posted by tut4nkh4m3n:ehh boy, prelims in two weeks leh you still asking this kinda qns...
all v. weak =[ lol -
2x is 2x leh. x is x. 2x means goes 2 round and 1 x is go thru 1 roundOriginally posted by tut4nkh4m3n:just divide by two i thought?
i'm not too gd with trigo too. but if you alr know 2x is 210 and 330, and you wana find x, isn't it just dividing by two? -
No....that step is incomplete i think...Originally posted by tut4nkh4m3n:just divide by two i thought?
i'm not too gd with trigo too. but if you alr know 2x is 210 and 330, and you wana find x, isn't it just dividing by two?
Cause If x is 0
So i think must add until 720 degrees...then can divide by two...
Haha my trio like abit rusty also..so anything a bit unsure just clarify here lor... -
TYS ftwOriginally posted by Y_Shun:my permutations/combinations/sets/log/surds/identities
all v. weak =[ lol -
Originally posted by Y_Shun:my permutations/combinations/sets/log/surds/identities
all v. weak =[ lol hese are the topics im damn strong in 
PnC and identities are either u see it or u don though...jus practise alot..esp for PnC..so u know when to P and when to C
Im in a tight situation with trigo differentiation though =/ -
yeah okay which means just keep adding rounds and dividing by two right?Originally posted by lpx88:No....that step is incomplete i think...
Cause If x is 0
So i think must add until 720 degrees...then can divide by two...
Haha my trio like abit rusty also..so anything a bit unsure just clarify here lor...
either way your final ans should be btwn 0 and 390 degrees right?
it's just how many ans you have right? -
Yep.Originally posted by tut4nkh4m3n:yeah okay which means just keep adding rounds and dividing by two right?
either way your final ans should be btwn 0 and 390 degrees right?
it's just how many ans you have right? -
anyway, o lvl no kick one lah. i'm just really afraid of the prelims.
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P n C i dunno leh...
especially the part abt what specificed guy must stand here...cannot tahan those qtns. -
wah... 1 simple question 20 replies within half hr
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My teacher told me they based this yr's prelims on the past yr O lvl papers...So jus spam tys all the way lo...Originally posted by tut4nkh4m3n:anyway, o lvl no kick one lah. i'm just really afraid of the prelims. -
that's gd news. cos all those qns set by our own are so queer...Originally posted by lpx88:My teacher told me they based this yr's prelims on the past yr O lvl papers...So jus spam tys all the way lo... -
Exactly...I see that green booklet of past yr papers quite a number i dont even know how to begin lorOriginally posted by tut4nkh4m3n:that's gd news. cos all those qns set by our own are so queer...