Question 1127165
a) (4 sin x-1)(3 sin x -1)=0
sin x=(1/4) or 1/3
x=.25 radians or .34 radians

b) multiply by xab
ab=bx+ax
factor the x out
ab=x(a+b)
x=ab/(a+b)

c)multiply all by x^2
x^4-2x^2-3=0, after moving the 2 to the left
factor 
(x^2-3)(x^2+1)=0
x=+/- sqrt (3) and +/- i.  Must check these answers, and they both work.

{{{graph(300,300,-10,10,-10,10,x^2-(3/x^2)-2)}}}