Verify that 2tan (x/2)= (sin2x+1-cos2)/(sin x(1+cos x)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 21E
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Verify that 2tan (x/2)= (sin2x+1-cos2)/(sin x(1+cos x) 

Expert Solution
Step 1

Consider the given condition that,

2tan (x/2) = (sin2x+1–cos2x)/(sin x(1+cos x)) … (1)

Consider the left hand side of (1) and simplify further as follows.

sin(x)
and tan(x)=
2 sin(u)
-
2tan
cos (u)
cos (x)
2[cos(u1)sin(1)]
cos (u)
4 cos (и)sin(u)|
2cos (u)
2-2(cos(u)- sin (u))
1-1+2cos²(u)
2.(sin ( 2u))
[: sin 2x = 2sin x cos.x
and cos 2x =-1+2cos (x)
1+ cos (2u)
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