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4. Find dx2d2y​ for each of the following. (a) y=3x4+x31​−x​2​+1 (b) y=5x+x3x3+7​ 5. Find dxdy​ for each of the following. Don't simplify your answer. (a) y=(sinx+2cosx)tanx (b) y=(2−x)sec2x (c) y=e3x+x2tan(x+1)3 (d) y=(4x2​+5x−x1​)6