Sin36=? without using calculator
[QUOTE=mialkan;107293]Sin36=? without using calculator[/QUOTE
For solving this problem.....At first,u consider the value of sin(210 deg)= -1/2,
now we know that 210=36*5;
write the equation....sin(5*36)= -1/2 & then express the equation as a function of sin(36 deg) means sin(5x) in terms of sinx....and then solve the equation...
after solving the equation ....U will get the result.