integral of (x+1)(cos (x+1))
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integral(uv)=u(integral of v)-integral of derivative of u (integral of v)
here x+1=u and cos(x+1)=v
integral of (x+1)(cos(x+1)=(x+1)(sin(x+1)+cos(x+1)
here x+1=u and cos(x+1)=v
integral of (x+1)(cos(x+1)=(x+1)(sin(x+1)+cos(x+1)
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