Question: Show that a. d x d ( ( x 3 + 3 ) s e c h ( l n x ) ) = 4

Show that a.dxd((x3+3)sech(lnx))=4xb. cosh(x+y)=coshxcoshy+sinhxsinhy, by using definition of coshx and sinhx.

Show that a.dxd((x3+3)sech(lnx))=4x

b. cosh(x+y)=coshxcoshy+sinhxsinhy, by using definition of coshx and sinhx.

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