関連ワード:  is x 2 a continuous function    is 1 x 2 a continuous function    is y = x^2 a continuous function    is f(x)=x^2 a continuous function    cos x 2 is a continuous function    fx cos x 2 is a continuous function    show that cos x 2 is a continuous function    prove that sin x 2 is a continuous function    prove that cos x 2 is a continuous function    show that fx cos x 2 is a continuous function