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IGCSE/GCSE/O & A Level/IB/University Student Forum
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GCE AS & A2 Level
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Math
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Trig question
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Topic: Trig question (Read 2700 times)
Eamyzz
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Posts: 845
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Re: Trig question
«
Reply #15 on:
October 08, 2009, 12:50:01 am »
u wont get me i mean that in da exam can they wite it in this form or u guys r just abreviating it
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cel
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Posts: 3
Reputation: 13
Re: Trig question
«
Reply #16 on:
October 09, 2009, 03:49:37 pm »
sry..it's tan
2
x=sec
2
x-1
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Eamyzz
SF Senior Citizen
Posts: 845
Reputation: 217
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Re: Trig question
«
Reply #17 on:
October 14, 2009, 02:06:00 am »
Quote from: cel on October 09, 2009, 03:49:37 pm
sry..it's tan
2
x=sec
2
x-1
huh???
dnt get ur pt
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Hope=Life
Life=Love
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Ghost Of Highbury
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Namaskaram!
Re: Trig question
«
Reply #18 on:
October 14, 2009, 06:43:50 am »
Quote from: Eamyzz on October 14, 2009, 02:06:00 am
huh???
dnt get ur pt
its a formula he suggested to be used in the first Q..
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nid404
Guest
Re: Trig question
«
Reply #19 on:
October 14, 2009, 08:22:32 am »
ok from what I did
2tan
2
xcosx=3
2tan
2
x=2sin
2
x/ 2cos
2
x
substituting u get
2sin
2
x/ 2cos
2
x X cosx =3
2sin
2
x/2cosx=3
sin
2
x/cosx=3
sin
2
x=1-cos
2
x
1-cos
2
x/cosx=3
1-cos
2
x=3cosx
3cosx+cos
2
x-1=0
check the question again plzz
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Ghost Of Highbury
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Re: Trig question
«
Reply #20 on:
October 14, 2009, 08:35:00 am »
@nid - 2tan
2
x = 2sin
2
x/cos
2
x not 2sin
2
x/
2
cos
2
x
1) 2tan
2
x cos x = 3
first simplify this to..
2sin
2
x/cos x = 3
cross multiply to get
3 cos x = 2sin
2
x
3cos x - 2sin
2
x = 0
-2 sin
2
x = 2cos
2
x - 2
so it becomes... 3cos x + 2cos
2
x -2 =0
hence proved..
«
Last Edit: October 14, 2009, 08:38:13 am by ~Am~
»
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nid404
Guest
Re: Trig question
«
Reply #21 on:
October 14, 2009, 08:38:52 am »
oh yes....no wonder.....silly error
ho gaya....question solved
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Eamyzz
SF Senior Citizen
Posts: 845
Reputation: 217
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No star can shine with a brocken heart =)
Re: Trig question
«
Reply #22 on:
October 14, 2009, 04:42:48 pm »
Quote from: Eamyzz on October 14, 2009, 02:06:00 am
huh???
dnt get ur pt
oooooh gt it
Thanks
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Hope=Life
Life=Love
So,No life=No hope=DEATH
am alive =D
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IGCSE/GCSE/O & A Level/IB/University Student Forum
»
Qualification
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GCE AS & A2 Level
»
Subject Doubts
»
Math
»
Trig question