1.
[sin⁡(tan⁡−134)]2+[sin⁡(tan⁡−143)]2=\left[ \sin \left( \tan^{-1} \frac{3}{4} \right) \right]^2 + \left[ \sin \left( \tan^{-1} \frac{4}{3} \right) \right]^2 =