Question
Find the principal solutions of 2sin2x−sin x−1=0
Answer: Option B
:
B and C
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B and C
2sin2x−sin x−1=0Let sin x=t2t2−t−1=0t=1±√1−4×2×(−1)2×2t=1±34t=1 or t=−12sin x=1 or sin x=−12x=π2 or x=−π6
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