Hi I need help with these 2 questions. The options chosen are wrong so I need help

1.

COS X The derivative of edt is sin x Ocos(x)esin(x) + sin(x)ecos(x) O1 O-cos(x)e sin(x) - sin(x)ecos(x) ecos(x) _ psin(x) O esin(x) + ecos(x)Let c be a constant. For what value(s) of c is the integral 4 dx improper? (i.e. for what c value(s) would we need to use the x- 1 Type 2 Improper Integral techniques to solve?) All c on the interval [1, co). All c on the interval (-co, co). .The only constant which makes this integral improper is c = 1. All c on the interval (-co, 1]. This integral is never improper. 0 / 1 point