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OpenStudy (anonymous):
which of the following are solutions to sinxcosx=-1/4? A. 7pi/6+npi B. 7pi/12+npi C. 7pi/12+npi/2 D. 11pi/12+npi
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myininaya (myininaya):
recall sin(2x)=2sin(x)cos(x)
myininaya (myininaya):
So if we multiply 2 on both sides we have 2sin(x)cos(x)=-2/4 can you take it from here?
myininaya (myininaya):
by the by way you can reduce that one fraction and say 2sin(x)cos(x) is sin(2x)
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