Hi everyone.I need to know what is "t" in this equation.

(1+0.25cost)×(cos7t)=0.1

I dont need numeric solution.I need step by step solution.

Thanks.

Hi everyone.I need to solve this equation and find x:

(1+a×cos(theta1×x))×cos(theta2×x)=b;

theta2 is bigger than theta1.a and b are constant number.I need to know how solve it?