\\sec(\delta) = -6/5 tan(\delta)\\\\\\ \frac{1}{cos(\delta)}}=\frac{-6Sin(\delta)}{5cos(\delta)}\\\\ so\qquad \delta \ne n\pi\;\;radians \quad n\in Z\qquad and\\\\ 1=\frac{-6Sin(\delta)}{5}\\\\ \frac{5}{-6}=sin(\delta)\\\\ \delta $must be in 3rd or 4th quadrant$\\ $but tan has to be neg so $\delta $ must be in the 4th quad $\\\\ \delta=asin(\frac{-5}{6})
sin360∘−1(−56)=−56.442690238079∘
δ≈−560±360NwhereN∈Z
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\\sec(\delta) = -6/5 tan(\delta)\\\\\\ \frac{1}{cos(\delta)}}=\frac{-6Sin(\delta)}{5cos(\delta)}\\\\ so\qquad \delta \ne n\pi\;\;radians \quad n\in Z\qquad and\\\\ 1=\frac{-6Sin(\delta)}{5}\\\\ \frac{5}{-6}=sin(\delta)\\\\ \delta $must be in 3rd or 4th quadrant$\\ $but tan has to be neg so $\delta $ must be in the 4th quad $\\\\ \delta=asin(\frac{-5}{6})
sin360∘−1(−56)=−56.442690238079∘
δ≈−560±360NwhereN∈Z