Evaluate the integrals in Exercises 41–60.
45. ∫tanh(x/7)dx

Evaluate the integrals in Exercises 39–56.

49. ∫3sec²t/(6 + 3tan(t)) dt

Evaluate the integrals in Exercises 39–56.

56. ∫sec(x)dx/√(ln(sec(x)+tan(x)))

Evaluate the integrals in Exercises 41–60.

41. ∫sinh(2x)dx

Evaluate the integrals in Exercises 41–60.

43. ∫6cosh(x/2 - ln3)dx

Evaluate the integrals in Exercises 41–60.

47. ∫sech²(x - 1/2)dx

Evaluate the integrals in Exercises 41–60.

49. ∫(sech(√t)tanh(√t)dt)/√t

Evaluate the integrals in Exercises 31–78.

43. ∫tan(ln v)/v dv

Evaluate the integrals in Exercises 31–78.

47. ∫(1/r)csc²(1+ln(r))dr