Scrivi le equazioni delle rette passanti per A (0; 9) e tangenti alla parabola di equazione y = 3x^2 - 4x + 12
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STR is a triangle as shown in the picture. If Luke decided to subtract 128º from 180º, that's because he understood that the sum of the internal angles in a triangle is 180º, and therefore the angles RST and TRS together make 128º.
As a result, RST will be
128º - TRS
where TRS is the angle at R, as shown in the picture
As a result, RST will be
128º - TRS
where TRS is the angle at R, as shown in the picture