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- · 2020 (10) 3-2i (13) (16) 144}. cosC — as sin 45 D 30 (11) 10 ( (2) (7) (12) 5 (15) COS A —...
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· 2020 (10) 3-2i (13) (16) 144}. cosC — as sin 45 D 30 (11) 10 ( (2) (7) (12) 5 (15) COS A — 5 13 13 a < c sin A— 13 12 — , cos2A 13 13
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