Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Mathematics Differential Calculus Second Order Derivatives

যদি y = p cos 2x + q sin 2x হয়, তাহলে \(\rm \dfrac{d^2y}{dx^2}\) কত এর সমান হবে?

1
-2y
2
-4y
3
2y
4
4y
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