Find the derivative of the function. y = a9 + (cos(x))9
It keeps saying its wrong... heres what i did:
sum rule,
derivative of a^9 + derivative of (cos(x))9
9a^8 + ..........
outside function = x^9
derivative of outside function= 9x^8
inside function= cos(x)
derivative of inside function= -sin(x)
......... 9(cos[x])^8 * -sin(x)
9a^8 + (9(cos[x])^8 * -sin(x))
Its asking for y'(x)=