(-sin(y) - six *cos(y)/y + twelve *sin(y)/y^ two)/y^ three = zero
( minus sinus of (y) minus 6 multiply by co sinus of e of (y) divide by y plus 12 multiply by sinus of (y) divide by y squared ) divide by y cubed equally 0
( minus sinus of (y) minus six multiply by co sinus of e of (y) divide by y plus twelve multiply by sinus of (y) divide by y to the power of two) divide by y to the power of three equally zero
(-sin(y) - 6*cos(y)/y + 12*sin(y)/y2)/y3 = 0
-siny - 6*cosy/y + 12*siny/y2/y3 = 0
(-sin(y) - 6*cos(y)/y + 12*sin(y)/y²)/y³ = 0
(-sin(y) - 6*cos(y)/y + 12*sin(y)/y to the power of 2)/y to the power of 3 = 0
(-sin(y) - 6cos(y)/y + 12sin(y)/y^2)/y^3 = 0
(-sin(y) - 6cos(y)/y + 12sin(y)/y2)/y3 = 0
-siny - 6cosy/y + 12siny/y2/y3 = 0
-siny - 6cosy/y + 12siny/y^2/y^3 = 0
(-sin(y) - 6*cos(y) divide by y + 12*sin(y) divide by y^2) divide by y^3 = 0