Which list shows the steps in the correct order? Review the steps in the derivation of the tangent sum
identity. The steps are not in order
O I + II → IV – III
1
sin(x + y)
cos(x + y)
O I - IV - || - |
III - | - || - IV
III | → IV + ||
II
sin (x) cos (y) cos(x) sin(y)
+
cos (x) cos(y) cos (x) cos())
cos (x) cos(y) sin (x) sin (9)
cos (x) cos (y) cos (x) cos()
-
=
tan (x) + tan (y)
1 -tan (x) tan (y)