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17. An expression equivalent to sin 0 + cot 0 cos 0 is A. 1 B. csc 0 C. sec 0 cot ' 0 Hint: Simplify using reciprocal trigonometric identities. are 2 - csc 0 18. The restrictions on the variable for the expression A. 076 TL + 2 TEN, 6 5T + 2 xn, not, n E I B. 076 1 + 2 TEN, 1 15 + 2Tn, 2 Itni, n E I C. 073 + 1 + 2 TIN, 3 4TC + 2Ten, 7 1+nn, ne I D. 076 5T + 2 TEN, 6 7 TC + 2 TCM, 2 1 +ni, n E I pe o Hint: The denominator cannot be equal to zero