The previous page is sending you to https://www.quora.com/Why-can%E2%80%99t-I-use-trig-substitution-using-the-identity-cos-2x+-sin-2x-1-to-solve-this-int-frac3-sqrt-1-4x-2-dx.

 If you do not want to visit that page, you can return to the previous page.