How to simplify the trigonometric term? \(\displaystyle{\frac{{{2}{\tan{{\left({\frac{{{x}}}{{{2}}}}\right)}}}}}{{{\left({\tan{{\left({\frac{{{x}}}{{{2}}}}\right)}}}-{1}\right)}^{{2}}}}}+{\frac{{{{\tan}^{{2}}{\left({\frac{{{x}}}{{{2}}}}\right)}}+{1}}}{{{2}{\tan{{\left({\frac{{{x}}}{{{2}}}}\right)}}}}}}\)

Keenan Rhodes

Keenan Rhodes

Answered question

2022-04-07

How to simplify the trigonometric term?
2tan(x2)(tan(x2)1)2+tan2(x2)+12tan(x2)

Answer & Explanation

betazpvaf4

betazpvaf4

Beginner2022-04-08Added 9 answers

Let y=x2
Then using the identities
sec2y=1+tan2y
sin2y=2sinycosy
the expression becomes
2tany(tany1)2+tan2y+12tany=2tanytan2y+12tany+sec2y2tany
=2sinycosy1cos2y2sinycosy+1cos2y2sinycosy
=2sinycosy12sinycosy+12sinycosy
=sin2y1sin2y+1sin2y
=sin22ysin2y+1sin2y(1sin2y)
=sin2xsinx+1sinx(1sinx)
=2sinx2sin2x22(sinx1)sinx
as you have stated.

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