Question
Find the values of : cosec 780°
✓
Answer
\begin{aligned}
& \operatorname{cosec} 780^{\circ}=\operatorname{cosec}\left(720^{\circ}+60^{\circ}\right) \\
& =\operatorname{cosec}\left(2 \times 360^{\circ}+60^{\circ}\right) \\
& =\operatorname{cosec} 60^{\circ} \\
& =\frac{2}{\sqrt{3}} \\
\end{aligned}
& \operatorname{cosec} 780^{\circ}=\operatorname{cosec}\left(720^{\circ}+60^{\circ}\right) \\
& =\operatorname{cosec}\left(2 \times 360^{\circ}+60^{\circ}\right) \\
& =\operatorname{cosec} 60^{\circ} \\
& =\frac{2}{\sqrt{3}} \\
\end{aligned}
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