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OpenStudy (anonymous):
If sin(x)=1/3 and x is a second quadrant angle, find the value of sin(2x)
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OpenStudy (campbell_st):
well draw a diagram with the information. |dw:1414991472633:dw| then you need to know sin(2x) =2sin(x)cos(x) so go back to the triangle... hope it helps
OpenStudy (campbell_st):
so can you find a using pythagoras..?
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