Quantitative Aptitude Trigonometry Circular Measure of Angles

sin 18° এর মান \({\sqrt 5 - 1} \over {4}\) হিসাবে দেওয়া হয়েছে। cosec 18° এর মান নির্ণয় কর।

1
\({ \sqrt 5 + 1} \over 4\)
2
\({ \sqrt 5 +1} \over 2\)
3
\(\sqrt 5 - 1\)
4
\(\sqrt 5 + 1\)

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