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Algebra Examples

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Find the Trig Value sin(a)=-12/13 , (3pi)/2<a<2pi ; tan(b)=-20/21 , pi/2<b<pi

I am unable to solve this problem.

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$

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