∫ 1/sinh2(x) dx = -cotanh + C
C is the constant of integration.
∫ 1/cosh2(x) dx = tanh(x) + C C is the constant of integration.
0
2
2
0
replace square root o x with t.
∫ f'(x)/√(af(x) + b) dx = 2√(af(x) + b)/a + C C is the constant of integration.
0
- ln ((x^2)-4)
∫ f'(x)/√[f(x)2 + a] dx = ln[f(x) + √(f(x)2 + a)] + C C is the constant of integration.
∫ f'(x)/√(a2 - f(x)2) dx = arcsin(f(x)/a) + C C is the constant of integration.
You need to use an integral. And the formula for an integral will vary depending on the shape of your non square area.