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#1 2019-11-29 14:13:51

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 2,000

[ASK] Prove

Prove that

. Can someone provide me some hints? I tried to manipulate the right-hand expression but got back to square one.


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#2 2019-11-29 20:41:48

George,Y
Member
Registered: 2006-03-12
Posts: 1,379

Re: [ASK] Prove

https://www.mathsisfun.com/algebra/trigonometric-identities.html


X'(y-Xβ)=0

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#3 2019-11-29 22:24:40

Bob
Administrator
Registered: 2010-06-20
Posts: 10,053

Re: [ASK] Prove

hi

Get a similar expression for sin(A+B) - sin(A-B).

Let A = x+y and B = x-y

Convert the LHS using these and simplify.

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob smile

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#4 2019-12-01 18:39:14

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 2,000

Re: [ASK] Prove

Well, I got this:

=
=
= cot(x - y) =

Last edited by Monox D. I-Fly (2019-12-01 18:41:01)


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

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