Finding Indefinite Integrals In Exercises 65–70, find the most general antiderivative or indefinite

Chapter 4.8 Antiderivatives Ex65-70
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Finding Indefinite Integrals In Exercises 65–70, find the most general antiderivative or indefinite integral. You may need to try a solution and then adjust your guess. Check your answers by differentiation.
65. ∫(1 + tan^2 Θ) dΘ
(Hint: 1 + tan^2 Θ = sec^2 Θ)
66. ∫(2 + tan^2 Θ) dΘ
67. ∫cot^2 x dx
(Hint: 1 + cot^2 x = csc^2 x)
68. ∫(1 - cot^2 x) dx
69. ∫ cos Θ (tan Θ + sec Θ) dΘ
70. ∫ csc Θ/(cscΘ - sinΘ)dΘ