Question 822503
find the smallest positive number x such that
sin^2(x)-4 sin x+1=0
solve for sin(x) using quadratic formula:
{{{sinx = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
a=1, b=-4, c=1
ans:
sinx≈0.2679
x≈0.2712
or
sinx&#8776;3.732(reject, -1 < sinx < 1)