Evaluate the following integrals:

Assume 1 + e^x = t

e^x = t - 1

d(1 + e^x) = dt

e^x dx = dt

dx =

Substitute t and dt we get

⇒

But t = 1 + e^x

⇒

58

Evaluate the following integrals:

59

Evaluate the following integrals:

61

Evaluate the following integrals:

62

Evaluate the following integrals:

∫ tan³2x sec 2x dx