Prove that   `(i) " 2 cos " 45^(@)  " cos  " 15^(@)=((sqrt(3)+1))/(2) "   "(ii) 2 " sin  " 75^(@)  "
Channel: Doubtnut
Date: 12/04/2020

Prove that   `(i) " 2 cos " 45^(@)  " cos  " 15^(@)=((sqrt(3)+1))/(2) "   "(ii) 2 " sin  " 75^(@)  " sin " 15^(@)=(1)/(2)`   `(iii)  " cos " 15^(@) - " sin  " 15 =(1)/(sqrt(2))`