1)x^4/x=2^4/4-(-1)^4/4=16/4-1/4=15/4=3.75
2)3∫x^(-1/3)dx=3*x^(-1/3+1)/(-1/3+1)=3x^(2/3)/(2/3)=9x^(2/3)/2=4.5x^(2/3)=
=4.5(9^(2/3)-4^(2/3))=4.5*(81^(1/3)-16^(1/3))
3)4*x^4/4-2x^2/2+x=x^4-x^2+x=3^4-3^2+3=81-9+3=75
4)-cosx-tgx=-cos(pi)-tg(pi)-(-cos0-tg0)=1-0-(-1-0)=2