Differentiate y = x2 + cos x - sin x.

Here is the differentiation for the question:

10. $y = x^2 + \cos x - \sin x$

    Step 1: Differentiate each term using the power rule and the derivatives of $\cos x$ and $\sin x$.

    $$\frac{dy}{dx} = \frac{d}{dx}(x^2) + \frac{d}{dx}(\cos x) - \frac{d}{dx}(\sin x)$$ $$\frac{dy}{dx} = 2x + (-\sin x) - (\cos x)$$ $$\frac{dy}{dx} = 2x - \sin x - \cos x$$

    The derivative is $2x - \sin x - \cos x$.