Question 633991
cot(30)*sin(30)*cos(30) = 1-sin^2(30)


(cos(30)/sin(30))*sin(30)*cos(30) = 1-sin^2(30)


cos(30)*cos(30) = 1-sin^2(30)


cos^2(30) = 1-sin^2(30)


1-sin^2(30) = 1-sin^2(30)


So the identity has been verified.