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OpenStudy (anonymous):
Which of the following are solutions to the equation sinx cosx =-1/4? Check all that apply. A.7pi/12+npi B.11pi/12+npi C.7pi/12+npi/2 D.7pi/6+npi
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OpenStudy (arindameducationusc):
what is n?
OpenStudy (anonymous):
I'm not sure, just part of the problem
OpenStudy (arindameducationusc):
Ok got it... wait.
OpenStudy (freckles):
use sin(2x)=2sin(x)cos(x) this is the double angle identity divide 2 on both sides you have 1/2*sin(2x)=sin(x)cos(x) replace sin(x)cos(x) with 1/2*sin(2x)
OpenStudy (arindameducationusc):
I agree with @freckles You will get x=pi/12 Then you can solve for n. Did you get it? Or you need more help
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OpenStudy (anonymous):
I got it. The answer was A and B
OpenStudy (arindameducationusc):
Congrats @melisa1m
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