Find the value of the expression: 20cos (228 *) – sin (42 *) / 4 sin (498 *) – sin (138 *)
| March 6, 2021 | education
20 * cos 228°- sin (42°) / 4sin (498°) – sin(138°) = 20 * cos (180° + 48°) – sin(90° – 48°)/ 4sin(450° + 48°) – sin(90° + 48°) = -20 *cos48° – cos48° / 4 * cos48° – cos48°) = -21 * cos 48° – ¼.
– 21 * cos 48° – ¼ ≈ -21* 0,67 -1/4 ≈ -14,32.
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