$7u^6 \times$
+## Product rule
+
+If $f(x)=u(x) \times v(x)$, then $f^\prime (x) = u(x) \times v^\prime(x) + v(x)\times u^\prime(x)$
+
+If $y=uv$, then derivative ${dy \over dx} = u{dv \over dx} + v{du \over dx}$
+
+Surds can be left on denomintaors.
+
+## Quotient rule
+
+If $f(x)={u(x) \over v(x)}$, then $f^\prime(x)={{v(x)u^\prime(x)-u(x)v^\prime(x)} \over [v(x)]^2}$
+
+If $y={u(x) \over v(x)}$, then derivative ${dy \over dx} = {{v{du \over dx} - u{dv \over dx}} \over v^2}$
+