Use a sum or difference formula to find the exact value of the trigonometric function. sin 12 . . . sin 12 (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)Use a calculator to find a decimal approximation for the following trigonometric function. sec 69 54' . . . sec 69 54' ~ (Simplify your answer. Type an integer or a decimal. Round to seven decimal places as needed.)To nd the distance AB across a river, a surveyor 356 m laid off a distance BC = 356 m on one side of the B ' C river. It is found that B =1123o' and c =1520'. I Find AB. A <:> The distance AB across the river is D m (Simplify your answer. Do not round until the final answer. Then round to the nearest whole number as needed.) For the rectangular coordinates (9, - 9), (a) plot the point, and (b) give two pairs of polar coordinates for the point, where 0 5 9