Question No. 1

Lesson#4
Question No. 1
Q1: Show that
(i) =4 sin⁡/2 sin⁡/2 sin⁡/2
(ii) =4 cos /2 cos /2 cos /2
R.H.S=4 cos /2 cos /2 cos /2
=4(/4∆)(√((−)/))(√((−)/))(√((−)/))
=(/∆) (√((−)(−)(−) ))/
=∆/∆
Application of Trigonometry
Chapter No 12
Exercise No 12.8
Mathematics
part 1