If 630^{\circ}< \theta< 810^{\circ} and \tan \theta=-\frac{7}{24}, then \cos (\frac{\theta}{4}) = [AP EAPCET 21 May 2025 S1]

Correct Answer is : −√7+5√210√2

-\sqrt{ {7+5 {\sqrt{2}}/{10 \sqrt{2}}}

\sqrt{ {7+5 {\sqrt{2}}/{2 \sqrt{2}}}

-\sqrt{ {5 {\sqrt{2}-7}/{10 \sqrt{2}}}

\sqrt{ {5 {\sqrt{2}-7}/{2 \sqrt{2}}}

Trigonometric Ratios and Identities

Section: Mathematics

Question : 20 of 50

Marks: +1, -0

If 630∘<θ<810∘ and tan‌θ=−‌

, then cos(‌

[AP EAPCET 21 May 2025 S1]

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