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If y = sin x + cos x then find d2y/dx2 |
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Answer» y = sin x + cos x differentiating w.r.t. x, dy/dx = (d sin x/dx) + (d cos x/dx) dy/dx = cos x - sin x Again differentiating w.r.t x, d2y/dx2 = (d cos x/dx) - (d sin x/dx) d2y/dx2 = - sin x - cos x d2y/dx2 = -(sin x + cos x) |
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