The truss shown in below is to be analysed using the direct stiffness method. The truss is constructed from aluminium (E = 70 GPa), with the length L, cross sectional area A and loads P1 and P2. Define functions A1 and A2. L A P A A L A L 22 A1= 3(6+ A 8) mm A2= 1.5(6+ A 8) mm P1= 4200 N P2=2800 N 0 = 34 degrees L = 0.6 m 122