I was recently set this question by my maths tutor and it took me ages to do :/ I'm wondering if I was just in the wrong mind set or if it really is hard... also it's kinda fun :] All it is is to prove that sin(a-b)=cos(b)sin(a)-cos(a)sin(b). Reactions?? :]

## Comments

Sort by:

TopNewestUm...Its shouldn't be that hard.You probably just missed something or you have figured it out by now. I'm too lazy to to type all that.. but it should look like Vishwesh's proof below or here's one from themathpages,Khan Academy. or mayb have a look at something simple and visual. Have fun. :) – Thaddeus Abiy · 4 years, 3 months ago

Log in to reply

– Rachel Piedmont · 4 years, 3 months ago

I like the visual proof.I don't get the others. :(Log in to reply

– Rachel Piedmont · 4 years, 3 months ago

Found u on facebook. Ill message u for details on the explanations.Log in to reply

– Thaddeus Abiy · 4 years, 3 months ago

Ok..cool..Be glad to help out.. :)Log in to reply

It can be proved easily if you allow me to use a little geometry + trigonometry for my help – Vishwesh Shrimali · 4 years, 3 months ago

Log in to reply

Sorry its hard for me to type all this. I am posting a link to the image of the solution I did. – Vishwesh Shrimali · 4 years, 3 months ago

Log in to reply

http://s20.postimg.org/rspadf73d/image.png

http://s20.postimg.org/s6qmd0r6x/image.png

Hope that helps.... :) – Vishwesh Shrimali · 4 years, 3 months ago

Log in to reply