Question 954175
if sin of theta is -2/7, and if tan>0, what is the cos of theta?
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use x for theta
reference angle theta is in quadrant III where sin<0, cos<0
sinx=-2/7
cosx=-&#8730;(1-sin^2(x))=-&#8730;(1-4/49)=-&#8730;(45/49)=-&#8730;45/7