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OpenStudy (anonymous):
if sin theta =1/4, theta in quadrant II, find the exact value of cos[theta +pi/6]
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OpenStudy (anonymous):
start here: |dw:1384060151281:dw|
OpenStudy (campbell_st):
well I'd start by drawing a 2nd quadrant diagram, |dw:1384060144970:dw| then use the sum of 2 angles expansion for cos cos(A + B) = cosAcosB - SinAsinB and you should be able to find cos(pi/6) its an exact value... just substitute and evaluate
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