Solve cosx(x+1-pi/4)-sinx

$$\cos x ( x + 1 - \frac { \pi } { 4 } ) - \sin x$$

Evaluate

$$\cos(\frac{x\left(4x+4-\pi \right)}{4})-\sin(x)$$

Differentiate w.r.t. x

$$\frac{-\sin(x^{2})\left(-\pi \sin(x)\sin(\frac{\pi x}{4})-\pi \cos(x)\cos(\frac{\pi x}{4})+4\sin(x)\sin(\frac{\pi x}{4})+4\cos(x)\cos(\frac{\pi x}{4})\right)+\cos(x^{2})\left(-8x\sin(\frac{\left(4-\pi \right)x}{4})-\pi \sin(\frac{\left(\pi -4\right)x}{4})-4\sin(\frac{\left(4-\pi \right)x}{4})\right)-8x\sin(x^{2})\left(\sin(x)\sin(\frac{\pi x}{4})+\cos(x)\cos(\frac{\pi x}{4})\right)-4\cos(x)}{4}$$