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## Homework Statement

For every x>-4 where x[tex]\in[/tex] [tex]\Re[/tex] applies

sinx+x[tex]\leq[/tex]f(x)[tex]\leq[/tex]8[tex]\sqrt{x+4}[/tex]-16

Find the gradient of the tangent to the curve of f at x[tex]_{0}[/tex]=0

Please help me I am trying to solve this exercise for more than two hours!

I'm desperate.