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Knowing the double angle formulae reduces this question to finding cos A, cos B, tan A, and tan B.
Since tan A = sin A / cos A, we are done if we can find cos A and cos B.
Use the identity (sin x)^2 + (cos x)^2 =1 and the fact that A and B are obtuse to find cos A and cos B.
Since tan A = sin A / cos A, we are done if we can find cos A and cos B.
Use the identity (sin x)^2 + (cos x)^2 =1 and the fact that A and B are obtuse to find cos A and cos B.
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