defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Differential Calculus Differentiation by substitution

If y = 5 cos x - 3 sin x, then \(\frac{{{d^2}y}}{{d{x^2}}}\) + y equals

1
8 sin x cos x
2
3 sin x cos x
3
1
4
0
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