Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2013-05-12 03:59:04

debjit625
Member
Registered: 2012-07-23
Posts: 101

### Trigonometric Prove

If

,prove that

I can't solve this part

Thanks

Last edited by debjit625 (2013-05-12 03:59:45)

Debjit Roy
___________________________________________________
The essence of mathematics lies in its freedom - Georg Cantor

Offline

## #2 2013-05-12 09:48:06

bob bundy
Registered: 2010-06-20
Posts: 8,323

### Re: Trigonometric Prove

hi debjit625

You can construct a recurrence relationship like this:

Using this repeatedly on the LHS, you can write T10 in terms of T8, which you can write in terms of T6 and so on.  Note that

So eventually you'll end up with a quadratic in Z, where all the terms cancel leaving zero as required for the RHS.

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

Offline

## #3 2013-05-14 18:09:21

debjit625
Member
Registered: 2012-07-23
Posts: 101

### Re: Trigonometric Prove

Thanks Bob I will try it.

Debjit Roy
___________________________________________________
The essence of mathematics lies in its freedom - Georg Cantor

Offline

## #4 2013-05-21 03:26:30

debjit625
Member
Registered: 2012-07-23
Posts: 101

### Re: Trigonometric Prove

I was bit busy with my studies so I didn't reply...
Yes ,bob it worked

Thanks again

Debjit Roy
___________________________________________________
The essence of mathematics lies in its freedom - Georg Cantor

Offline

## #5 2013-05-21 03:57:35

bob bundy
Registered: 2010-06-20
Posts: 8,323

### Re: Trigonometric Prove

Excellent!

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

Offline