In problem set 1, 1A-6 how can you express in the form Asin(x+c)? What trig properties are involved?

Question

noelgreco · Answer

The trig properties involved are the sin of a sum and a difference.

c is a constant.

Does that get you going?

anonymous · Answer

Thank you, but it still isn't clear for me... :(
Problem says: Express "sinx-cosx" in the form Asin(x+c)
So, what how can I find an appropriate A and c?

noelgreco · Answer

Since there's a minus sign, it must have come from the basic sin(x-c) which is equal to
 sin x cos c - sin c cos x.  Since you have a sin c and cos c to calculate, c must be an angle where sin c = cos c.  Calculate and factor out as A.

dinnertable · Answer

if you still need help, here's a link to the same question asked a while ago: http://openstudy.com/study#/updates/50d127b9e4b0091849d7ba4f

anonymous · Answer

Thank you, I didn't notice the previous question. :)