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Topics of this game:
- cosAsinB+sinAcosB
- cosAcosB+sinAsinB
- sinAcosB-cosAsinB
- 2sinAcosA
- cos^2A-sin^2A, 2cos^2A-1, 1-2sin^2A
- +or-square root of(1-cosB)/2
- +or-square root of(1+cosB)/2
