What is the magnetic flux through the coil in the direction of the +x+x-axis (Hint: The identity sin(A+B)+sin(A−B)=2sinAcosBsin⁡(A+B )+sin⁡(A−B)=2sin⁡Acos⁡B may prove helpful.)

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

it's a b and