8 1/t​dy/dt​=2cos²(y) , y(0) =π/4​(2) .
What is the solution for the differential equation?
a) y(t) =π/4​​arctan(t) +2
b) y(t) =π/4​​arcsin(t) +2
c) y(t) =π/4​​arccos(t) +2
d) y(t) =π/4​​arctan(t) -2