Teaching AWES Army Public School TGT Mock Test 2024 Mathematics Trigonometry Trigonometric Ratios

\(\sin θ =-\dfrac{4}{5}\) और θ तीसरे चतुर्थांश में हैं, तो \(\cos \dfrac{\theta}{2}\) किसके बराबर है?

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