Найти производную!!!!!!!!!!!!!!!!!!!!!!!!!

y=4(1-x²)⁻⁶
y'=-244(1-x²)⁻⁷*(-2x)=488x/(1-x²)⁷

y=xcosx+sin3x
[xcosx]'=u'v+v'u   u=x  u'=1       v=cosx   v'=-sinx
[xcosx]'=cosx-xsinx
y'=cosx-xsinx+3cos3x