Question

под б .пожайлуста.!!!!!!!!

Answer 1

$f(x)=xcos x,;x_0=fracpi2\f'(x)=(x)'cdotcos x+xcdot(cos x)'=cos x-xsin x\f'(x_0)=f'(fracpi2)=cosfracpi2-fracpi2sinfracpi2=0-fracpi2cdot1=-fracpi2$