If the region in the first quadrant bounded by the graph of y=cosx and the interval[0,pi/2] is bisected by the line x=c, guess c.

Answer 1

You need the
integral [cosx]dx from0 to c = integral [cosx]dx from c to π/2
sinc = sin π/2 - sinc
2sinc = sin π/2
sinc = 1/2
c = π/6

Why are you supposed to "guess" ?

Answer 2

thats what the question said