If F(x)= 8sinx/7+cosx then find F'(1) and F'(4pi)
You can use the quotient rule to compute the derivative.
Can you go from here? Do you see anything "special" (think trig) in the numerator of [tex] \frac{\cos^2 x + 7 \cos x + \sin^2 x} {(7 + \cos x)^2} [/tex] ??
Try to finish this. If you have further questions, don't hesitate to ask.
-Andy