how calculate sin18=(root5)-1)/4 in Fx991es
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sin 18 =(√5-1)÷4
Let O =18
50=90degree
20+30 =90degree
20= 90degree -30
sin 20=sin(90degree -30)
sin 20 = cos 30
2 sinO coso = 4 cos^(3) - 3coso
4 cos^(3) o - 3cos - 2sino coso = 0
coso (4 cos^(2) O -3 -2sino)= 0
=coso not equal to 0
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