defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Differential Calculus Second Order Derivatives
If \(\rm y(\theta)=\frac{2\cos \theta+\cos 2\theta}{\cos 3\theta+4\cos 2\theta+5\cos\theta+2}\) then at \(\rm \theta=\frac{\pi}{2}\), y'' + y' + y is equal to
1
\(\frac{3}{2}\)
2
1
3
\(\frac{1}{2}\)
4
2