Evaluate the integrals in Exercises 45–76. 2(cos x)-1/2 sin x dx (tan x)-3/2 sec²x dx 45. 46. (20 + 1 + 2 cos (20 + 1)) d0 47. 2 sec"(20 – m) do 48. 20 п (t + 1)² – 1 -dt 50. 49. dt 14 | Vi sin (2r/2) dt (sec 0 tan 0) V1 + sec 0 d0 51. 52. e* sec² (e* – 7) dx 53.

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