Question: I f y = 2 c o s ( x 2 ) , then d 2 y d x 2 = ( A ) -

Ify=2cos(x2), then d2ydx2=
(A)-8cos(x2)
-sin(x2)
I f y = 2 c o s ( x 2 ) , then d 2 y d x 2 = ( A

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