We know that f(x)is a continuous function of period 5,which satisfies this relation in someneighborhood of x=0:f(1 sin x)-3f(1 -sin x)=8x a(x)Where a(x)is an infinitesimal of higher order than x when x→O,andf(x)isdifferentiable at x 1,find the tangent equation of the curve y f(x)at the point(6,f(6).