Because 1 is the quantity under the arc system, it is converted into an angle system of 57.3 degrees, which is (cos 57.3-sin 57.3)

In this question, the derivative function of f(x) is directly derived, and the negative exsinx is brought into 1, and the derivative function value is negative, then the slope at the time when the abscissa is 1 is negative and the inclination angle is obtuse.