Trigonometry
Find the exact value of tan(x+y)\tan\left(x+y\right)tan(x+y). Use a trigonometric identity.
cosx=−725\cos x=-\frac{7}{25}cosx=−257, siny=425\sin y=\frac{4}{25}siny=254, xxx and yyy in quadrant II
60911\frac{\sqrt{609}}{11}11609
−60911-\frac{\sqrt{609}}{11}−11609
−4(42+609)33-\frac{4\left(42+\sqrt{609}\right)}{33}−334(42+609)
−4(42−609)33-\frac{4\left(42-\sqrt{609}\right)}{33}−334(42−609)