Extract an expression for a couple acting on a current-carrying rectangular coil, held in a uniform magnetic field?

From the center of the loop, and the B-field is uniform,

B=2μI/4π x 2(sinα/a + sinβ/b) = μI/2π x 2(sinα/a + sinβ/b)

μ=4π*10^-7 T*m/A
I= the current
α=the angle along length a (use sinα in terms of opp/hyp if you wish)
β=the angle along length b (use sinβ in terms of opp/hyp if you wish)
a=the distance from the center to the more-wider side
b=the distance from the center to the less-wider side

There's the link to the video where this came from. Sorry that it looks completely mind-blowing. https://www.youtube.com/watch?v=wSJP0EqMLrw

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.