qqp question1: How do I differentiate [math]\frac{x-|x|}{x}[/math], [math]\sin (\cos x) \cos x[/math], [math]\sqrt{1-\sqrt{\sin 2x}}[/math], [math]3^{3-x}[/math], [math]3^{\frac{x}{2}}[/math], [math]x^x[/math]? question2: How do I differentiate [math]x^{2}+3[/math]?