hi I tried to solve it with solve and reduce functions and plot the output as a function of theta2 >>but it give me a Conditional Expression output and i cant turn it to numerical answer or a useful expression ....can anyone help me??
r1 = 100;
r2 = 30;
r3 = 70;
r4 = 90;
Theta2 = 60;
a = -r1 + r2 Cos[Theta2 ] + r3 Cos[Theta3] + r4 Cos[Theta4] ;
b = r2 Sin[Theta2] + r3 Sin[Theta3 ] + r4 Sin[Theta4] ;
Solve[{a == 0 ,b == 0} , {Theta3, Theta4}]
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