Asked by Hency

If y=2xsin2x+cos2x, find d²y/dx² if x=2p/3 in exact value
Answered by Steve
y' = 2sin2x + 4xcos2x - 2sin2x = 4xcos2x
y" = 4cos2x - 8xsin2x

so, just plug in your value for x ...
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