Additional Mathematics
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Example 4 Rain is falling vertically at 5 km h-^1 • A man is sitting by the window of a train travelling at 40 km hc^1 • In what ...
By the cosine rule, I oW I'= 402 + 102 -2 x 40 X 10 x cos 30° giving I oW I~ 31.7. AI so, 10 sine = 3IT sin30° g1vmg .. e ~^910. ...
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