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3cos p b sin p/2 b /cos b+3p. Cos(2п-b)+2sin(-3p/2+b)/2cos(b+2p. Cos(-2п-b)+3sin(-3п:2+b):2cos(b+3п). Cos2a+cos2b+cos2c.
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3cos p b sin p/2 b /cos b+3p. Cos(2п-b)+2sin(-3p/2+b)/2cos(b+2p. Cos(-2п-b)+3sin(-3п:2+b):2cos(b+3п). Cos2a+cos2b+cos2c. 