How do you prove: 2 tan 2 x = (sin x + cos x )/ (cos x − sin x) − (cos x − sin x)/ (cos x + sin x) ?
1 Answer
Feb 28, 2018
See below.
Explanation:
Identities:
1)
2)
3)
4)
Add the two fractions:
Expand and simplify denominator:
Simplify numerator:
Using identity 1
Using identity 4
Using identity 2
Using identity 3