найти значение выражения у=39 соs(2arctg1+arccos5\13)
Y = 39 * cos (2 * arctg 1 + arccos 5/13) = 39 * cos(π/2 + arccos 5/13) =
-39 * sin (arccos 5/13) = -39 * 12/13 = -36
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Y = 39 * cos (2 * arctg 1 + arccos 5/13) = 39 * cos(π/2 + arccos 5/13) =
-39 * sin (arccos 5/13) = -39 * 12/13 = -36