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## #1 2007-02-23 01:05:58

ganesh
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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

## #3 2007-03-31 20:47:31

serhat38
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### Re: Trignometry Ex.1

the value of second question is 1

## #4 2007-03-31 20:49:12

serhat38
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### Re: Trignometry Ex.1

value of third question is -9/7

## #5 2007-03-31 20:50:17

serhat38
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### Re: Trignometry Ex.1

the value of forth question is 1/7

## #6 2007-03-31 20:51:28

serhat38
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### Re: Trignometry Ex.1

the value of fifth question is 17/19

## #7 2007-03-31 20:53:07

serhat38
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### Re: Trignometry Ex.1

the value of sixth question is 1/7

## #8 2007-03-31 20:56:59

serhat38
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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
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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
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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