Finding a line tangent to a graph with FTC I think?

[sqfiy]

My best guess would be A? How does that sound?

 

[skeeter]

[MATH]h(x) = \int_a^x f(t) \, dt \implies h’(x) = f(x)[/MATH]
you’re finding the line tangent to [MATH]h(x)[/MATH] at [MATH]\left(\frac{\pi}{4},0\right)[/MATH]
try again

 

[HallsofIvy]

Since \(\displaystyle \pi/4\) is the lower limit of the integral, \(\displaystyle h(\pi/4)= 0\), not 1/2.