Solution Videos Step-by-step Solution Problem to solve: $\frac{d^2}{dx^2}\left(\sin\left(4x\right)\right)\cdot\cos\left(y\right)$ Specify the solving method SimplifyWrite in simplest formFactorFactor by completing the squareFind the integralFind the derivativeFind break even pointsSuggest a method or feature Send Final Answer Sorry, we couldn't solve this problem right now. Please check back later or try another solving method.