coso = 1/2 it is trigonometry functions
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cosO. Sum or difference of two angles: sin (a ± b) = sin acos b ±COS asin b ... 1. Undefined. 300. 2t/6. 1/2. -.11/2. -.11/3 .11. 2.11/3. 2. 45°. 2t14 .11/2. 1/2. 1. 1 .11.
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