Two sound sources emitting plane waves separated by 12 meter vibrates according to law y1=3cos4πt and y2=4sin4πt respectively. A point in the medium is at a position 8m from first source and 4m from second on the line joining two sources. The sources out waves of velocity 32 m/s. find equation of the motion of the particles (y1, y2are in centimeter and t is in second)  
A)  yR=5sin(4πt+tan−1(43))
B)  yR=−5sin(4πt+tan−1(34))
C)  yR=−5sin(4πt+tan−1(43))
D)  yR=5sin(4πt+tan−1(34

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?