# 直角三角形トラス（60度）
E = 2e11
A = 7e-4
L1 = sqrt(3)
L2 = 1
P = 1e4

deg60 = deg2rad(60)
sin60 = sin(deg60)
cos60 = cos(deg60)

R1 = [-P*cos60*sin60, P*cos60^2]
R2 = [P*sin60*cos60, P*sin60^2]
lambda1 = (L1/(E*A))*P*cos60
lambda2 = (L2/(E*A))*P*sin60
delta = [lambda1*sin60 - lambda2*cos60, lambda1*cos60 + lambda2*sin60]
sigma1 = E*lambda1/L1
sigma2 = E*lambda2/L2

@show E
@show A
@show P
@show R1
@show R2
@show delta
@show sigma1
@show sigma2