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There is no visible symbol between " ... equals 4" and "2b plus 1".
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That's an equation in which b = -1
No. But sin2a equals 1 minus cos2a ... and ... cos2a equals 1 minus sin2a
1 plus 1 plus 1 plus 1 equals 1 times 4. 1 times 4 equals 4. 4 minus 4 equals 0. 0
13...... 9 plus 5 equals 14...... 14 minus 1 equals 13
1 plus 1 equals one fact