Question

sin 25dgree *cos 65degree + cos 25degree* sin 65dgree

Answer 1

Step-by-step explanation:

sin 25*cos65*+cos 25*sin65*

=(sin25*) (cos 90*-25*)+cos25*(sin(90*-65*)

=( sin25*)(sin25*)+(cos25*)(cos25*)

=sin2 25*+cos2 25*

=1(sin2A+cos2 A=1)

$2$