hi

pls help

how to solve a set of simultaneous equations that goes as follows?

cos(theta1)+cos{theta2).....cos(theta5)=5*ma

cos(3*theta1)+cos(3*theta2).....cos(3*theta5)=0

cos(5*theta1)+cos(5*theta2)......cos(5*theta5)=0

cos(7*theta1)+cos(7*theta2).......cos(7*theta5)=0

the equations continue till cos(11*theta)....