cos(630) ≈ 0.825sin(1470) ≈ 0.433ctg(1125) = 1 / tan(1125)
Let's find tan(1125) firsttan(1125) = sin(1125) / cos(1125) ≈ 4.7536
Therefore, ctg(1125) = 1 / tan(1125) ≈ 0.2105
Nowcos(630) - sin(1470) - ctg(1125≈ 0.8253 - 0.4339 - 0.210≈ 0.1809.
So, the value of the expression is approximately 0.1809.
cos(630) ≈ 0.825
sin(1470) ≈ 0.433
ctg(1125) = 1 / tan(1125)
Let's find tan(1125) first
tan(1125) = sin(1125) / cos(1125) ≈ 4.7536
Therefore, ctg(1125) = 1 / tan(1125) ≈ 0.2105
Now
cos(630) - sin(1470) - ctg(1125
≈ 0.8253 - 0.4339 - 0.210
≈ 0.1809.
So, the value of the expression is approximately 0.1809.