Use Product Rule: We need to use the product rule to differentiate h(x)=ln(x)cos(x), which states that (fg)′=f′g+fg′. Let's differentiate ln(x) and cos(x) separately.
Differentiate ln(x): Differentiate ln(x) to get x1.
Differentiate cos(x): Differentiate cos(x) to get −sin(x).
Apply Product Rule: Now apply the product rule: h′(x)=(ln(x))′(cos(x))+(ln(x))(cos(x))′.
Substitute Derivatives: Substitute the derivatives into the product rule: h′(x)=(x1)(cos(x))+ln(x)(−sin(x)).
Simplify Expression: Simplify the expression: h′(x)=xcos(x)−ln(x)sin(x).