A) 2
B) 4
C) 3
D) None of these
Correct Answer: A
Solution :
\[y={{c}_{1}}\cos 2x+\frac{{{c}_{1}}}{2}(1+\cos 2x)\] \[+\frac{{{c}_{3}}}{2}(1-\cos 2x)+{{c}_{4}}\] \[=\left( \frac{{{c}_{3}}}{2}+\frac{{{c}_{3}}}{2}+{{c}_{4}} \right)+\left( {{c}_{1}}+\frac{{{c}_{2}}}{2}-\frac{{{c}_{3}}}{2} \right)\cos 2x\] \[=A+B\cos 2x\] \[\therefore \]Equation has only two independent parameters Hence, order is 2.
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