Question 29
If the answer is not an integer, give the nearest integer. If the calculated answer has more than five digits, give its last five digits.
Let $\theta\in[0,\pi/2]$ and $\cos2\theta=1/8$. Write $\cos3\theta+\cos\theta=a/b$ for coprime positive integers $a,b$. Find $a+b$.
Let $\theta\in[0,\pi/2]$ and $\cos2\theta=1/8$. Write $\cos3\theta+\cos\theta=a/b$ for coprime positive integers $a,b$. Find $a+b$.