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Step-by-step explanation:
b 2tanO*SinO(1-tanO) + 2SinOSec²O/(1+tanO)²
2SinO { tanO(1-tanO)+Sec²O }/(1+tanO)²
2SinO{tanO-tan²O+1+tan²O}/ (1+tanO)²
2SinO(1+tanO)/(1+tanO)²
2SinO /(1+tanO)
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