75 . F(x ) = (* + 2 ) at 76. F(x) = 1 ( 12 + 1 ) dt Jo Jo 77. F(x) = 3/t dt 78. F(x) = Stat 79. F(x) = sec? t dt 80. F(x) = sec t tan t dt J TT / 4 In Exercises 81-86, use the Second Fundamental Theorem of Calculus to find F'(x). 81. F(x) = (12 - 21) dt 82. F(x) = 12 12 + 1 dt 83. F(x) = 84. F(x) = 4/t dt 85. F(x) = t cost di 86. F(x) = sec3 t dt In Exercises 87-92, find F'(x). x+2 87. F(x) = (4t + 1) dt 88. F(x) = 13 dt Jx J-x (sin x 89. F(x) = Vidt 90. F(x) = 1 73 dt 91. F(x) = sin 12 dt 92. F(x) = sin 02 de