Hi all mathlinkers

here i will post trigonometry problems and i wish that it will be good for al

(Flower)(Flower)(Flower)(Flower)(Flower)(Flower)

(1)

http://i99.servimg.com/u/f99/12/89/99/77/110.jpg

with my best wishes

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- Dec 1st 2009, 12:10 PMmrmohamedSeries in Trigonometry
**Hi all mathlinkers**

**here i will post trigonometry problems and i wish that it will be good for al**

(Flower)(Flower)(Flower)(Flower)(Flower)(Flower)

**(1)**

**http://i99.servimg.com/u/f99/12/89/99/77/110.jpg**

**with my best wishes** - Dec 1st 2009, 01:21 PMSoroban
Hello, mrmohamed!

Quote:

1) Prove that: .

We have: .

. . . . .

. . . . .

. . . . .

. . . . .

. . . . .

- Dec 1st 2009, 01:27 PMmrmohamed
- Dec 1st 2009, 01:30 PMJameson
- Dec 1st 2009, 01:35 PMmrmohamed
- Dec 2nd 2009, 04:11 AMmrmohamed
**Hi all**

**my methode**

- Dec 2nd 2009, 04:18 AMmrmohamed
**Hi all**

**( 2 )**

**(Flower)(Flower)(Flower)(Flower)(Flower)(Flower)**

**http://i99.servimg.com/u/f99/12/89/99/77/210.jpg**

**with my best wishes**

**mrmohamed**

**(Clapping)(Clapping)(Clapping)(Clapping)(Clapping) (Clapping)**

- Dec 2nd 2009, 06:17 AMsimplependulum
Note that

Similarly ,

so we have to consider

But i guess you have a better and interesting method to solve it (Happy) - Dec 2nd 2009, 08:18 AMmrmohamed

**Hi all**

**I wish the idea will be new**

**unusual methode**

**with my best wishes**

**mrmohamed** - Dec 10th 2009, 02:50 AMmrmohamed
**Hi all**

**(3)**

**(Clapping)(Clapping)(Clapping)(Clapping)(Clapping) (Clapping)(Clapping)(Clapping)(Clapping)(Clapping)**

http://i19.servimg.com/u/f19/12/89/99/77/310.jpg

**with my best wishes**

**mrmohamed** - Dec 10th 2009, 03:04 AMsimplependulum

similar to the others

finally we have