Evaluate the integrals in Exercises 31–78.
35. ∫sec²x e^(tan x)dx

Evaluate the integrals in Exercises 87–96.

89. ∫₀¹ 2^(−θ) dθ

Evaluate the integrals in Exercises 87–96.

91. ∫₁^(√2) x·2^(x²) dx

Evaluate the integrals in Exercises 87–96.

93. ∫₀^(π/2) 7^(cos t) sin t dt

Evaluate the integrals in Exercises 31–78.

49. ∫x3^(x²)dx

Evaluate the integrals in Exercises 33–54.

∫ 2t e^(-t²) dt

Evaluate the integrals in Exercises 33–54.

∫ (e^(1/x) / x²) dx

Evaluate the integrals in Exercises 33–54.

49. ∫ e^(sec πt) sec πt tan πt dt

Evaluate the integrals in Exercises 31–78.

31. ∫e^x sin(e^x)dx