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Using the chain rule with u = 2x:

y = sin(2x) becomes y = sin(u)

dy/dx = dy/du * du/dx

dy/du = cos(u)

du/dx = 2

So dy/dx = dy/du * ...

There are many ways to solve quadratic equations including completing the square, factorisation and using the quadratic equation.

Factorisation involves breaking the quadratic equation in...

Definite integrals produces a numerical answer. It is asking the question: what is the area under the curve f(x) between x=a and x=b.

Indefinite integrals produces a function. It is askin...