In a moving coil galvanometer, the deflection of the coil θ is related to the electric current i by the relation
(i) cosecθ+cotθcosecθ−cotθ=(cosecθ+cotθ)2=1+2cot2θ+2cosecθcotθ
(ii) secθ+tanθsecθ−tanθ=(secθ+tanθ)2=1+2tan2θ+2secθtanθ