CalculusEasy ShareCalculus · Easy problemFind ∫cos(3x) dx\displaystyle\int \cos(3x)\,dx∫cos(3x)dx (let u=3xu=3xu=3x).A13sin(3x)+C\dfrac{1}{3}\sin(3x)+C31sin(3x)+CB13sin(3x)−C\dfrac{1}{3}\sin(3x)-C31sin(3x)−CC13sin(4x)+C\dfrac{1}{3}\sin(4x)+C31sin(4x)+CD31sin(3x)+C\dfrac{3}{1}\sin(3x)+C13sin(3x)+CCheck Show answer Walk through it step by step Practice more like this