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#1 2007-02-23 01:05:58
- ganesh
- Moderator
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Trignometry Ex.1
1. If
what is tan A?
2. If
,
find the value of
.
3. If
,
find the value of
4. If 3 tanθ = 4, determine the value of
.
5. If 5cosθ-12sinθ=0, what is the value of
?
6. If 16cotA=12, find the value of
.
7. Prove that
.
8. Prove that
.
9. Prove that
.
10. Prove that
.
Character is who you are when no one is looking.
#2 2007-03-31 20:11:52
- serhat38
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Re: Trignometry Ex.1
if sinA=5/13 so cosA=12/13 then sinA/cosA=tanA (5/13)/(12/13)=5/12=tanA
#8 2007-03-31 20:56:59
- serhat38
- Novice
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Re: Trignometry Ex.1
(sin+cos)\(sin-cos)=[(sin\cos)+1]\[(sin\cos)-1]
=[(sin+cos)\cos]\[(sin-cos)\cos]
=(sin+cos)\(sin-cos)
so (sin+cos)\(sin-cos)=(sin+cos)\(sin-cos)
#9 2007-03-31 21:03:50
- serhat38
- Novice
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Re: Trignometry Ex.1
if tan.cot=1
(1-tan)\(1+tan)=(cot-1)\(cot+1)
cot+1-tan.cot-tan=cot-1+tan.cot-tan
so 1-tan.cot=tan.cot-1
2=2tan.cot
tan.cot=1
#10 2007-03-31 21:06:14
- serhat38
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Re: Trignometry Ex.1
tan.tan=(sin.sin)\(cos.cos)
tan.tan.cos=(sin.sin)\(cos.cos)\cos
=(sin.sin)\cos
=(sin\cos).sin
=tan.sin
#11 2007-03-31 21:11:13
- serhat38
- Novice
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Re: Trignometry Ex.1
now dear ganesh please solve this
cos2∏\11+cos4∏\11+cos6∏\11+cos8∏\11+cos10∏\11=?
the value is a rational