if sec theta = 13/5 on the interval(90,180), find the exact value of sin 2 theta
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1 answer

if secTheta=13/5, then cosTheta=5/13
cos^2 + sin^2=1
sin^2=125/169=144/169
sinTheta=12/13 (in second quadrant, positive0
sin(2Theta)=2sinTheta*cosTheta=2(12/13)(5/13)= you do it.
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