Sin 2B = 2 sin B is true when B is equal to
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sin 0° is the answer
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BY FORMULA
SIN2B=2(SINB)(COSB) —>(1)
IN THE QUESTION YOU GAVE THAT SIN2B=2SINB SUB IN eq.(1)
SIN2B=2SINB(COSB)
2SINB=2SINB(COSB)
COSB=1
☆ B = 0°
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