[tex]f(x)=2x^2-1\\f'(x)=4x\\f'(-1)=4\cdot(-1)=-4\\f'(2)=4\cdot2=8[/tex]
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[tex]f(x)=x^3\\f'(x)=3x^2\\f'(-2)=3\cdot(-2)^2=3\cdot4=12\\f'(3)=3\cdot3^2=3\cdot9=27[/tex]
