In Exercises 67-74, rewrite each expression in terms of the given function or functions. tan x + cot X 67. sec x + csc x 68. sin x ; cos x 1+ tan x csc x cos x 1 + sin x 1 69. + tan x; cos X 70. sin x cos x cot x; cot x cos X 1 + cos x 72. (sec x + csc x)(sin x + cos x) – 2 - cot x; tan x 1 71. 1 csc x cos x 73. csc x 1 - sin x -; sec x and tan x sin x" 1 + sin x 74. 1 + sin x sec x and tan x 1 - sin x