a) cosx-sinx f'(0)=1
в) 2x(x^3+x)+(x^2-1)(3x^2+1)=2x^4+2x^2+3x^4-1-2x^2=5x^4-1
5*(-1)^4-1=5-1=4
г)7/(2sqrt(7x-3))
7/(2sqrt(7-3))=7/4
a) cosx-sinx f'(0)=1
в) 2x(x^3+x)+(x^2-1)(3x^2+1)=2x^4+2x^2+3x^4-1-2x^2=5x^4-1
5*(-1)^4-1=5-1=4
г)7/(2sqrt(7x-3))
7/(2sqrt(7-3))=7/4