Use the definition m = limf(x+h)-f(x) to find the slope of the tangent to the curve 6-0 h f(x)=x²-1 at the point P(-2,-9). Find "(x) for f(x)=sec (x). Findf)(x) for f(x)=(3-2x)-¹. Write the equation, in slope-intercept form, of the line tangent to the curve y=x²-4 at x=5.