Recent content by GrahamCU

bump for help. is this an identity? [2cosasinb]2 = sin2a sin2b

Ok, I actually just made a mistake typing the question in here. I fixed it now, and posted pictures of my work so you can see how I got there. The last line (now correct in first post) should have been show how [2cosasinb]2 = sin2a sin2b Thanks for your help :)

ok thanks, I'll double check my work again, and if it doesn't work out, post my complete work to see

Homework Statement The problem is essentially (I've rephrased it, but this is what it is asking) show that [ (2n1cosa) / (n2cosa + n1cosb) ]2 is equal to (sin2a sin2b) / (sin2(a+b)cos2(a-b)) where these are for refraction through materials and satisfy n1sina=n2sinb 2. The...

SOLVED:Agreement of 2 values This is my first post, so I hope this is the write section for it.. How do you check if 2 values agree with each other (I've seen it called the "comparison test", but I can't find what I'm looking for by google-ing that). For example, you have x1=563+-12...