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OpenStudy (anonymous):
sec 3(theta)/2 = -2
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OpenStudy (anonymous):
Lets call theta x. 3x/2 = sec^-1(-2) we know sec^-1(a) = cos^-1(1/a) so 3x/2 = cos^-1(-1/2) 3x/2 = 2pi/3 so x or theta = 4pi/9
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