This is part of the QCE Specialist Maths course. In this post, we will learn to integrate functions by using squared trigonmoetric functions using:
 sin^2(x) = \frac{1}{2}(1-cos(2x))  cos^2(x) = \frac{1}{2}(1+cos(2x))  tan^2(x) + 1 = sec^2(x)
https://www.youtube.com/watch?v=PyLXFY3VkNE
https://www.youtube.com/watch?v=flvhNBoOsiA
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